Video doesn't play twice anymore , but it does produce this stack trace upon pressing skip next:
(On ubuntu 8.04,installed through tar balls,Elisa 0.5.29)

sudeshc@Elisa-iMac:~$ elisa
Launcher core version: 0.5.29
Current core version: 0.5.29
/usr/lib/python2.5/site-packages/elisa-0.5.29-py2.5.egg/elisa/core/utils/classinit.py:34: UserWarning: ClassInitMeta class is deprecated
  warn("ClassInitMeta class is deprecated")
WARN  coherence                   Feb 25 10:59:05  Coherence UPnP framework version 0.6.2 starting... (coherence/base.py:275)
WARN  webserver                   Feb 25 10:59:05  WebServer on port 50092 ready (coherence/base.py:110)
/usr/lib/python2.5/site-packages/elisa-0.5.29-py2.5.egg/elisa/core/service_manager.py:27: DeprecationWarning: ServiceProvider.start is deprecated.
  warn("ServiceProvider.%s is deprecated." % attr, DeprecationWarning)
Traceback (most recent call last):
Failure: elisa.plugins.lirc.lirc_input.NoMappingsFound: Given InputMap 'streamzap.map' not found

WARN  MainThread      input_manager               Feb 25 10:59:05  Creating elisa.plugins.lirc.lirc_input:LircInput failed. A full traceback can be found at /tmp/elisa_5r2nzB.txt (elisa/core/manager.py:97)
WARN  MainThread      gst_metadata_slave_process_protocol Feb 25 10:59:06  Starting Slave-2 on unix:/tmp/elisa-metadata-l9Jdfi.socket launching elisa.plugins.gstreamer.amp_slave.run_slave
(Slave-2 stdout) (elisa/plugins/amp/master.py:54)
WARN  MainThread      gst_metadata_slave_process_protocol Feb 25 10:59:06  /usr/lib/python2.5/site-packages/elisa-0.5.29-py2.5.egg/elisa/core/utils/classinit.py:34: UserWarning: ClassInitMeta class is deprecated
  warn("ClassInitMeta class is deprecated")
(Slave-2 stderr) (elisa/plugins/amp/master.py:57)
Traceback (most recent call last):
Failure: exceptions.RuntimeError: hildon not running

WARN  MainThread      service_manager             Feb 25 10:59:06  Creating elisa.plugins.osso.osso_service:OssoService failed. A full traceback can be found at /tmp/elisa_6L7rVz.txt (elisa/core/manager.py:97)
WARN  MainThread      gst_metadata_slave_process_protocol Feb 25 10:59:11  Starting Slave-5 on unix:/tmp/elisa-metadata-5r3k06.socket launching elisa.plugins.gstreamer.amp_slave.run_slave
(Slave-5 stdout) (elisa/plugins/amp/master.py:54)
WARN  MainThread      gst_metadata_slave_process_protocol Feb 25 10:59:11  /usr/lib/python2.5/site-packages/elisa-0.5.29-py2.5.egg/elisa/core/utils/classinit.py:34: UserWarning: ClassInitMeta class is deprecated
  warn("ClassInitMeta class is deprecated")
(Slave-5 stderr) (elisa/plugins/amp/master.py:57)
==> at https://login.yahoo.com/config/login?.src=flickr&.pc=5134&.scrumb=0&.pd=c%3DE0.GahOp2e4MjkX.5l2HgAoLkpmyPvccpVM-&.intl=us&.done=https%3A%2F%2Flogin.yahoo.com%2Fconfig%2Fvalidate%3F.src%3Dflickr%26.pc%3D5134%26.scrumb%3D0%26.pd%3Dc%253DE0.GahOp2e4MjkX.5l2HgAoLkpmyPvccpVM-%26.intl%3Dus%26.done%3Dhttp%253A%252F%252Fwww.flickr.com%252Fsignin%252Fyahoo%252F%253Fredir%253D%25252Fservices%25252Fauth%25252F%25253Fperms%25253Ddelete%252526api_key%25253Def2cc311ac8916c794b436bf482c5de5%252526frob%25253D72157614406453372-69b96f49171d426b-933456%252526api_sig%25253Dbb3ea17b534c5ee195bbff1fccffb99e
Note: submit is using submit button: name=".save", value="Sign In"
Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/twisted/internet/defer.py", line 601, in gotResult
    _deferGenerator(g, deferred)
  File "/usr/lib/python2.5/site-packages/twisted/internet/defer.py", line 578, in _deferGenerator
    deferred.callback(result)
  File "/usr/lib/python2.5/site-packages/twisted/internet/defer.py", line 239, in callback
    self._startRunCallbacks(result)
  File "/usr/lib/python2.5/site-packages/twisted/internet/defer.py", line 304, in _startRunCallbacks
    self._runCallbacks()
--- <exception caught here> ---
  File "/usr/lib/python2.5/site-packages/twisted/internet/defer.py", line 317, in _runCallbacks
    self.result = callback(self.result, *args, **kw)
  File "/usr/lib/python2.5/site-packages/elisa_plugin_flickr-0.1-py2.5.egg/elisa/plugins/flickr/resource_provider.py", line 269, in response_read
    raise ValueError('%s: %s' %(err_code, err_msg))
exceptions.ValueError: 108: Invalid frob

WARN  MainThread      flickr_resource_provider    Feb 25 10:59:15  Login to Flickr failed. Full output at /tmp/elisa_Z3vUPf.txt (elisa/plugins/flickr/resource_provider.py:90)
WARN  MainThread      default                     Feb 25 10:59:36  Failed to set audio visualization 'libvisual_jess' (elisa/plugins/poblesec/player_video.py:665)
WARN  MainThread      default                     Feb 25 10:59:36  Failed to set audio visualization 'libvisual_jess' (elisa/plugins/poblesec/player_video.py:665)
ERROR:dbus.connection:Unable to set arguments (None,) according to signature u'u': <type 'exceptions.TypeError'>: long() argument must be a string or a number, not 'NoneType'
WARN  MainThread      application                 Feb 25 10:59:53  An Traceback occurred and got saved to /tmp/elisa_kJOj1Q.txt (elisa/core/application.py:316)
<type 'exceptions.TypeError'>
Python 2.5.2: /usr/bin/python
Wed Feb 25 10:59:49 2009

A problem occurred in a Python script.  Here is the sequence of
function calls leading up to the error, in the order they occurred.

 /usr/lib/python2.5/site-packages/elisa_plugin_gnome-0.1-py2.5.egg/elisa/plugins/gnome/gnome_screensaver_service.py in _playback_ended(self=<elisa.plugins.gnome.gnome_screensaver_service.GnomeScreensaverService object at 0x94d586c>, player=<Player object at 0x9b5c07c (elisa+plugins+poblesec+player_video+Player at 0x9bd2930)>)
  152     def _playback_ended(self, player):
  153         # just unInhibit
  154         self._un_inhibit()
  155 
  156     def _player_status_cb(self, player, status):
self = <elisa.plugins.gnome.gnome_screensaver_service.GnomeScreensaverService object at 0x94d586c>
self._un_inhibit = <bound method GnomeScreensaverService._un_inhibi...ice.GnomeScreensaverService object at 0x94d586c>>

 /usr/lib/python2.5/site-packages/elisa_plugin_gnome-0.1-py2.5.egg/elisa/plugins/gnome/gnome_screensaver_service.py in _un_inhibit(self=<elisa.plugins.gnome.gnome_screensaver_service.GnomeScreensaverService object at 0x94d586c>)
  122         self.pm_iface.UnInhibit(cookie,
  123                                 reply_handler=lambda : dfr.callback(None),
  124                                 error_handler=lambda x: dfr.errback(x))
  125 
  126         return dfr
error_handler undefined
x undefined
dfr = <Deferred at 0x912a4ac>
dfr.errback = <bound method Deferred.errback of <Deferred at 0x912a4ac>>

 /var/lib/python-support/python2.5/dbus/proxies.py in __call__(self=<dbus.proxies._ProxyMethod instance at 0x9af1ecc>, *args=(None,), **keywords={})
  130                                         reply_handler,
  131                                         error_handler,
  132                                         **keywords)
  133         else:
  134             return self._connection.call_blocking(self._named_service,
keywords = {}

 /var/lib/python-support/python2.5/dbus/connection.py in call_async(self=<dbus._dbus.SessionBus (session) at 0x8490c8c>, bus_name=dbus.UTF8String(':1.2'), object_path='/org/gnome/Screensaver', dbus_interface='org.gnome.ScreenSaver', method='UnInhibit', signature=u'u', args=(None,), reply_handler=<function <lambda> at 0xb4cb2d14>, error_handler=<function <lambda> at 0xb4cb2a04>, timeout=-1.0, utf8_strings=False, byte_arrays=False, require_main_loop=True)
  541         # Add the arguments to the function
  542         try:
  543             message.append(signature=signature, *args)
  544         except Exception, e:
  545             logging.basicConfig()
message = <dbus.lowlevel.MethodCallMessage object at 0x9a5c330>
message.append = <built-in method append of dbus.lowlevel.MethodCallMessage object at 0x9a5c330>
signature = u'u'
args = (None,)
<type 'exceptions.TypeError'>: long() argument must be a string or a number, not 'NoneType'
    __class__ = <type 'exceptions.TypeError'>
    __delattr__ = <method-wrapper '__delattr__' of exceptions.TypeError object at 0x9a6162c>
    __dict__ = {}
    __doc__ = 'Inappropriate argument type.'
    __getattribute__ = <method-wrapper '__getattribute__' of exceptions.TypeError object at 0x9a6162c>
    __getitem__ = <method-wrapper '__getitem__' of exceptions.TypeError object at 0x9a6162c>
    __getslice__ = <method-wrapper '__getslice__' of exceptions.TypeError object at 0x9a6162c>
    __hash__ = <method-wrapper '__hash__' of exceptions.TypeError object at 0x9a6162c>
    __init__ = <method-wrapper '__init__' of exceptions.TypeError object at 0x9a6162c>
    __new__ = <built-in method __new__ of type object at 0x8141b40>
    __reduce__ = <built-in method __reduce__ of exceptions.TypeError object at 0x9a6162c>
    __reduce_ex__ = <built-in method __reduce_ex__ of exceptions.TypeError object at 0x9a6162c>
    __repr__ = <method-wrapper '__repr__' of exceptions.TypeError object at 0x9a6162c>
    __setattr__ = <method-wrapper '__setattr__' of exceptions.TypeError object at 0x9a6162c>
    __setstate__ = <built-in method __setstate__ of exceptions.TypeError object at 0x9a6162c>
    __str__ = <method-wrapper '__str__' of exceptions.TypeError object at 0x9a6162c>
    args = ("long() argument must be a string or a number, not 'NoneType'",)
    message = "long() argument must be a string or a number, not 'NoneType'"

The above is a description of an error in a Python program.  Here is
the original traceback:

Traceback (most recent call last):
  File "/usr/lib/python2.5/site-packages/elisa_plugin_gnome-0.1-py2.5.egg/elisa/plugins/gnome/gnome_screensaver_service.py", line 154, in _playback_ended
    self._un_inhibit()
  File "/usr/lib/python2.5/site-packages/elisa_plugin_gnome-0.1-py2.5.egg/elisa/plugins/gnome/gnome_screensaver_service.py", line 124, in _un_inhibit
    error_handler=lambda x: dfr.errback(x))
  File "/var/lib/python-support/python2.5/dbus/proxies.py", line 132, in __call__
    **keywords)
  File "/var/lib/python-support/python2.5/dbus/connection.py", line 543, in call_async
    message.append(signature=signature, *args)
TypeError: long() argument must be a string or a number, not 'NoneType'