Backtrace...

(gdb) r
Starting program: /usr/bin/rhythmbox 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
[New Thread 0xb7d7bb40 (LWP 3003)]
[New Thread 0xb73ffb40 (LWP 3004)]
[New Thread 0xb1674b40 (LWP 3005)]
[New Thread 0xb0e73b40 (LWP 3006)]
[Thread 0xb0e73b40 (LWP 3006) exited]
[New Thread 0xb0e73b40 (LWP 3008)]
[Thread 0xb0e73b40 (LWP 3008) exited]
[New Thread 0xb0e73b40 (LWP 3016)]
[New Thread 0xb02fab40 (LWP 3017)]
[New Thread 0xafaf9b40 (LWP 3018)]
[Thread 0xafaf9b40 (LWP 3018) exited]
[New Thread 0xafaf9b40 (LWP 3032)]

(rhythmbox:2990): GLib-CRITICAL **: g_str_has_prefix: assertion `str != NULL' failed
Traceback (most recent call last):
  File "/usr/lib/rhythmbox/plugins/ubuntuone/MusicStoreWidget.py", line 97, in url_loaded
    if urlparse.urlparse(url)[2] == "https":
  File "/usr/lib/python2.7/urlparse.py", line 135, in urlparse
    tuple = urlsplit(url, scheme, allow_fragments)
  File "/usr/lib/python2.7/urlparse.py", line 174, in urlsplit
    i = url.find(':')
AttributeError: 'NoneType' object has no attribute 'find'
[New Thread 0xaedaab40 (LWP 3033)]
[Thread 0xaedaab40 (LWP 3033) exited]

** (rhythmbox:2990): WARNING **: Error calling get_info: Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/dbus/service.py", line 707, in _message_cb
    retval = candidate_method(self, *args, **keywords)
  File "/usr/lib/python2.7/dist-packages/ubuntuone-client/ubuntuone/platform/linux/dbus_interface.py", line 723, in get_info
    return self.service.folders.get_info(path)
  File "/usr/lib/python2.7/dist-packages/ubuntuone-client/ubuntuone/syncdaemon/interaction_interfaces.py", line 166, in inner
    result = f(*new_args, **new_kwargs)
  File "/usr/lib/python2.7/dist-packages/ubuntuone-client/ubuntuone/logger.py", line 283, in inner
    res = f(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/ubuntuone-client/ubuntuone/syncdaemon/interaction_interfaces.py", line 717, in get_info
    mdobj = self.fs_manager.get_by_path(path)
  File "/usr/lib/python2.7/dist-packages/ubuntuone-client/ubuntuone/syncdaemon/filesystem_manager.py", line 794, in get_by_path
    mdid = self._idx_path[path]
KeyError: '/home/philip/.ubuntuone/Purchased from Ubuntu One'


** (rhythmbox:2990): CRITICAL **: syncdaemon_folder_info_get_subscribed: assertion `SYNCDAEMON_IS_FOLDER_INFO (finfo)' failed
[Thread 0xb1674b40 (LWP 3005) exited]
[New Thread 0xaedaab40 (LWP 3060)]
[New Thread 0xb1674b40 (LWP 3061)]
[New Thread 0xae5a9b40 (LWP 3062)]
[Thread 0xaedaab40 (LWP 3060) exited]
[Thread 0xae5a9b40 (LWP 3062) exited]
[New Thread 0xae5a9b40 (LWP 3065)]
[New Thread 0xaedaab40 (LWP 3067)]

Program received signal SIGILL, Illegal instruction.
0x05cb2042 in ?? ()
(gdb) bt
#0  0x05cb2042 in ?? ()
#1  0x02c3ac0d in execute (globalData=<optimized out>, 
    callFrame=<optimized out>, registerFile=0xb037248c, this=0xaeddfdf0)
    at ../Source/JavaScriptCore/jit/JITCode.h:115
#2  JSC::Interpreter::execute (this=0xb0372480, program=0xaeddfde0, 
    callFrame=0xaee1fcb4, scopeChain=0xaedfffe0, thisObj=0xaee5ffc0)
    at ../Source/JavaScriptCore/interpreter/Interpreter.cpp:1139
#3  0x02d14aa6 in JSC::evaluate (exec=0xaee1fcb4, scopeChain=0xaedfffe0, 
    source=..., thisValue=..., returnedException=0xbfffe9f8)
    at ../Source/JavaScriptCore/runtime/Completion.cpp:73
#4  0x00ac22ee in evaluate (exception=0xbfffe9e8, thisValue=..., source=..., 
    chain=<optimized out>, exec=0xaee1fcb4)
    at ../Source/WebCore/bindings/js/JSMainThreadExecState.h:85
#5  WebCore::ScriptController::evaluateInWorld (this=0xb033fb10, 
    sourceCode=..., world=0xb0322bc8)
    at ../Source/WebCore/bindings/js/ScriptController.cpp:145
#6  0x00ac294b in WebCore::ScriptController::evaluate (this=0xb033fb10, 
    sourceCode=...) at ../Source/WebCore/bindings/js/ScriptController.cpp:162
#7  0x00c3c30a in executeScript (sourceCode=..., this=0xadcb6858)
    at ../Source/WebCore/dom/ScriptElement.cpp:288
#8  WebCore::ScriptElement::executeScript (this=0xadcb6858, sourceCode=...)
    at ../Source/WebCore/dom/ScriptElement.cpp:270
#9  0x00dc252d in WebCore::HTMLScriptRunner::executePendingScriptAndDispatchEven---Type <return> to continue, or q <return> to quit---
t (this=0xb03b7620, pendingScript=...)
    at ../Source/WebCore/html/parser/HTMLScriptRunner.cpp:139
#10 0x00dc2a56 in WebCore::HTMLScriptRunner::executeParsingBlockingScript (
    this=0xb03b7620) at ../Source/WebCore/html/parser/HTMLScriptRunner.cpp:118
#11 0x00dc2fd8 in WebCore::HTMLScriptRunner::executeParsingBlockingScripts (
    this=0xb03b7620) at ../Source/WebCore/html/parser/HTMLScriptRunner.cpp:195
#12 0x00dc301b in WebCore::HTMLScriptRunner::executeScriptsWaitingForLoad (
    this=0xb03b7620, cachedScript=0xadd4c900)
    at ../Source/WebCore/html/parser/HTMLScriptRunner.cpp:206
#13 0x00db4c52 in WebCore::HTMLDocumentParser::notifyFinished (
    this=0xb03a4000, cachedResource=0xadd4c900)
    at ../Source/WebCore/html/parser/HTMLDocumentParser.cpp:517
#14 0x00eb3abb in checkNotify (this=0xadd4c900)
    at ../Source/WebCore/loader/cache/CachedResource.cpp:237
#15 WebCore::CachedResource::checkNotify (this=0xadd4c900)
    at ../Source/WebCore/loader/cache/CachedResource.cpp:230
#16 0x00ebf2ec in data (data=..., this=0xadd4c900, 
    allDataReceived=<optimized out>)
    at ../Source/WebCore/loader/cache/CachedScript.cpp:104
#17 WebCore::CachedScript::data (this=0xadd4c900, data=..., 
    allDataReceived=true) at ../Source/WebCore/loader/cache/CachedScript.cpp:96
#18 0x00f1dcd9 in didFinishLoading (finishTime=0, this=0xadce2600)
    at ../Source/WebCore/loader/SubresourceLoader.cpp:276
---Type <return> to continue, or q <return> to quit---
#19 WebCore::SubresourceLoader::didFinishLoading (this=0xadce2600, 
    finishTime=0) at ../Source/WebCore/loader/SubresourceLoader.cpp:263
#20 0x00f13605 in WebCore::ResourceLoader::didFinishLoading (this=0xadce2600, 
    finishTime=0) at ../Source/WebCore/loader/ResourceLoader.cpp:451
#21 0x010506aa in WebCore::readCallback (source=0x8f91068, 
    asyncResult=0x8232598, data=0xadcc6590)
    at ../Source/WebCore/platform/network/soup/ResourceHandleSoup.cpp:670
#22 0x003374a1 in ?? () from /usr/lib/i386-linux-gnu/libgio-2.0.so.0
#23 0x0034bb55 in g_simple_async_result_complete ()
   from /usr/lib/i386-linux-gnu/libgio-2.0.so.0
#24 0x01d64706 in ?? () from /usr/lib/i386-linux-gnu/libsoup-2.4.so.1
#25 0x01d63c75 in ?? () from /usr/lib/i386-linux-gnu/libsoup-2.4.so.1
#26 0x0044f243 in g_cclosure_marshal_VOID__VOIDv ()
   from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
#27 0x0044d727 in ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
#28 0x00466a29 in g_signal_emit_valist ()
   from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
#29 0x00467453 in g_signal_emit ()
   from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
#30 0x01d67d7d in soup_message_finished ()
   from /usr/lib/i386-linux-gnu/libsoup-2.4.so.1
#31 0x01d7b5ca in ?? () from /usr/lib/i386-linux-gnu/libsoup-2.4.so.1
#32 0x01d7b81f in ?? () from /usr/lib/i386-linux-gnu/libsoup-2.4.so.1
---Type <return> to continue, or q <return> to quit---
#33 0x01d7c144 in ?? () from /usr/lib/i386-linux-gnu/libsoup-2.4.so.1
#34 0x004d3740 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#35 0x004d5cda in g_main_context_dispatch ()
   from /lib/i386-linux-gnu/libglib-2.0.so.0
#36 0x004d60e5 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#37 0x004d61c1 in g_main_context_iteration ()
   from /lib/i386-linux-gnu/libglib-2.0.so.0
#38 0x0037c764 in g_application_run ()
   from /usr/lib/i386-linux-gnu/libgio-2.0.so.0
#39 0x08048b70 in main (argc=1, argv=0xbffff3f4) at main.c:99
(gdb)