see here:
https://bugs.launchpad.net/bugs/725925

If it is not enough, I tried your tips with gdb tips:

#0  0x0172bf37 in XQueryExtension () from /usr/lib/libX11.so.6
No symbol table info available.
#1  0x0171faab in XInitExtension () from /usr/lib/libX11.so.6
No symbol table info available.
#2  0x01380c46 in ?? () from /usr/lib/mesa/libGL.so.1
No symbol table info available.
#3  0x0137d23b in glXQueryVersion () from /usr/lib/mesa/libGL.so.1
No symbol table info available.
#4  0x0131bdec in glxewContextInit () from /usr/lib/libGLEW.so.1.5
No symbol table info available.
#5  0x01325fe3 in glewInit () from /usr/lib/libGLEW.so.1.5
No symbol table info available.
#6  0x011c15cf in RenderTarget::RenderTarget (this=0x8756518, texsize=1024, 
    width=512, height=512)
    at /build/buildd/projectm-2.0.1+dfsg/src/libprojectM/Renderer/FBO.cpp:100
        mindim = 0
        origtexsize = 0
#7  0x011a9dd7 in Renderer::Renderer (this=0x87530b8, width=512, height=512, 
    gx=32, gy=24, texsize=1024, beatDetect=0x8773030, _presetURL=..., 
    _titlefontURL=..., _menufontURL=...)
    at /build/buildd/projectm-2.0.1+dfsg/src/libprojectM/Renderer/Renderer.cpp:44
        buffer = {st_dev = 5025253470240928, __pad1 = 0, st_ino = 0, 
  st_mode = 18052032, st_nlink = 1152, st_uid = 18052080, 
          st_gid = 18046964, st_rdev = 610009257266607040, __pad2 = 57496, 
          st_size = 17080195, st_blksize = 141910632, st_blocks = 18796532, 
          st_atim = {tv_sec = 141910632, tv_nsec = 16474100}, st_mtim = {
            tv_sec = 156, tv_nsec = 142028848}, st_ctim = {
            tv_sec = -1073749816, tv_nsec = 16250457}, __unused4 = 156, 
          __unused5 = 141881448}
#8  0x0116a758 in projectM::projectM_init (this=0x8756080, gx=32, gy=24, 
    fps=35, texsize=1024, width=512, height=512)
    at /build/buildd/projectm-2.0.1+dfsg/src/libprojectM/projectM.cpp:488
        __PRETTY_FUNCTION__ = "void projectM::projectM_init(int, int, int, int, int, int)"
#9  0x0116b368 in projectM::readConfig (this=0x8756080, configFile=...)
    at /build/buildd/projectm-2.0.1+dfsg/src/libprojectM/projectM.cpp:223
        config = {myDelimiter = {static npos = <optimized out>, 
            _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x872fdf4 "="}}, 
          myComment = {static npos = <optimized out>, 
            _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x873af44 "#"}}, 
          mySentry = {static npos = <optimized out>, 
            _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
  _M_p = 0x87561d4 "EndConfigFile"}}, myContents = {_M_t = {
              _M_impl = {<std::allocator<std::_Rb_tree_node<std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >> = {<__gnu_cxx::new_allocator<std::_Rb_tree_node<std::pair<std::basic_string<char, std::char_traits<char>, std::allocator<char> > const, std::basic_string<char, std::char_traits<char>, std::allocator<char> > > > >> = {<No data fields>}, <No data fields>}, 
                _M_key_compare = {<std::binary_function<std::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::basic_string<char, std::char_traits<char>, std::allocator<char> >, bool>> = {<No data fields>}, <No data fields>}, 
                _M_header = {_M_color = std::_S_red, _M_parent = 0x8755d60, 
                  _M_left = 0x8756668, _M_right = 0x87563d0}, 
                _M_node_count = 15}}}}
#10 0x0116bf9b in projectM::projectM (this=0x8756080, config_file=..., flags=1)
    at /build/buildd/projectm-2.0.1+dfsg/src/libprojectM/projectM.cpp:121
No locals.
#11 0x00168442 in QProjectM (this=0x86d1468)
    at /build/buildd/projectm-2.0.1+dfsg/src/build/projectM-qt/../../projectM-qt/qprojectm.hpp:32
No locals.
#12 QProjectMWidget::initializeGL (this=0x86d1468)
    at /build/buildd/projectm-2.0.1+dfsg/src/build/projectM-qt/../../projectM-qt
/qprojectmwidget.hpp:251
No locals.
#13 0x0123652f in QGLWidget::glInit() () from /usr/lib/libQtOpenGL.so.4
No symbol table info available.
#14 0x012a2adb in QGLWidget::resizeEvent(QResizeEvent*) ()
   from /usr/lib/libQtOpenGL.so.4
No symbol table info available.
#15 0x00343cee in QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
No symbol table info available.
#16 0x0123bf79 in QGLWidget::event(QEvent*) () from /usr/lib/libQtOpenGL.so.4
No symbol table info available.
#17 0x002eba94 in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
   from /usr/lib/libQtGui.so.4
No symbol table info available.
#18 0x002f064b in QApplication::notify(QObject*, QEvent*) ()
   from /usr/lib/libQtGui.so.4
No symbol table info available.
#19 0x00d965cb in QCoreApplication::notifyInternal(QObject*, QEvent*) ()
   from /usr/lib/libQtCore.so.4
No symbol table info available.
#20 0x00392223 in QWidgetPrivate::setGeometry_sys(int, int, int, int, bool) ()
   from /usr/lib/libQtGui.so.4
No symbol table info available.
/qprojectmwidget.hpp:251
No locals.
#13 0x0123652f in QGLWidget::glInit() () from /usr/lib/libQtOpenGL.so.4
No symbol table info available.
#14 0x012a2adb in QGLWidget::resizeEvent(QResizeEvent*) ()
   from /usr/lib/libQtOpenGL.so.4
No symbol table info available.
#15 0x00343cee in QWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
No symbol table info available.
#16 0x0123bf79 in QGLWidget::event(QEvent*) () from /usr/lib/libQtOpenGL.so.4
No symbol table info available.
#17 0x002eba94 in QApplicationPrivate::notify_helper(QObject*, QEvent*) ()
   from /usr/lib/libQtGui.so.4
No symbol table info available.
#18 0x002f064b in QApplication::notify(QObject*, QEvent*) ()
   from /usr/lib/libQtGui.so.4
No symbol table info available.
#19 0x00d965cb in QCoreApplication::notifyInternal(QObject*, QEvent*) ()
   from /usr/lib/libQtCore.so.4
No symbol table info available.
#20 0x00392223 in QWidgetPrivate::setGeometry_sys(int, int, int, int, bool) ()
   from /usr/lib/libQtGui.so.4
No symbol table info available.
---Type <return> to continue, or q <return> to quit---
#21 0x0033fb98 in QWidget::setGeometry(QRect const&) ()
   from /usr/lib/libQtGui.so.4
No symbol table info available.
#22 0x0034652c in QWidget::qt_metacall(QMetaObject::Call, int, void**) ()
   from /usr/lib/libQtGui.so.4
No symbol table info available.
#23 0x012a789a in QGLWidget::qt_metacall(QMetaObject::Call, int, void**) ()
   from /usr/lib/libQtOpenGL.so.4
No symbol table info available.
#24 0x0016762a in QProjectMWidget::qt_metacall (this=0x86d1468, 
    _c=QMetaObject::WriteProperty, _id=4, _a=0xbfffec0c)
    at /build/buildd/projectm-2.0.1+dfsg/src/build/projectM-qt/moc_qprojectmwidget.cxx:88
No locals.
#25 0x00d9cbca in QMetaObject::metacall(QObject*, QMetaObject::Call, int, void**) () from /usr/lib/libQtCore.so.4
No symbol table info available.
#26 0x00c8bc62 in ?? () from /usr/lib/libQtCore.so.4
No symbol table info available.
#27 0x00c89167 in ?? () from /usr/lib/libQtCore.so.4
No symbol table info available.
#28 0x00c893a9 in ?? () from /usr/lib/libQtCore.so.4
No symbol table info available.
#29 0x00c8c620 in QPropertyAnimation::updateState(QAbstractAnimation::State, QAbstractAnimation::State) () from /usr/lib/libQtCore.so.4
No symbol table info available.
#30 0x00c872db in ?? () from /usr/lib/libQtCore.so.4
No symbol table info available.
#31 0x007d8650 in ?? () from /usr/lib/libQtGui.so.4
No symbol table info available.
#32 0x00727b92 in ?? () from /usr/lib/libQtGui.so.4
No symbol table info available.
#33 0x007529c2 in ?? () from /usr/lib/libQtGui.so.4
No symbol table info available.
#34 0x0075704d in ?? () from /usr/lib/libQtGui.so.4
No symbol table info available.
#35 0x0075772b in ?? () from /usr/lib/libQtGui.so.4
No symbol table info available.
#36 0x003197cf in QLayoutPrivate::doResize(QSize const&) ()
   from /usr/lib/libQtGui.so.4
No symbol table info available.
#37 0x0031ac78 in QLayout::activate() () from /usr/lib/libQtGui.so.4
No symbol table info available.
#38 0x003481b9 in QWidget::setVisible(bool) () from /usr/lib/libQtGui.so.4
No symbol table info available.
#39 0x0805101d in show (argc=1, argv=0xbffff3b4)
at /usr/include/qt4/QtGui/qwidget.h:487
No locals.
#40 main (argc=1, argv=0xbffff3b4)
    at /build/buildd/projectm-2.0.1+dfsg/src/projectM-pulseaudio/qprojectM-pulseaudio.cpp:107
        config_file = {static npos = <optimized out>, 
          _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, 
            _M_p = 0x81f9bbc "/home/romain/.projectM/config.inp"}}
        audioMutex = {d = 0x81f9be8}
        mainWindow = 0x81f9c50
        pulseAction = <incomplete type>
        pulseThread = <value optimised out>
        app = <incomplete type>
        devChooser = warning: can't find linker symbol for virtual table for `QPulseAudioDeviceChooser' value

{<QDialog> = {<No data fields>}, <Ui::pulseDeviceChooserDialog> = {<Ui_pulseDeviceChooserDialog> = {layoutWidget = 0xbffff2b8, hboxLayout = 0x8051353, 
              vboxLayout = 0x80500ec, label = 0x805e76c, 
              devicesListView = 0x805e49c, 
              tryFirstPlayBackMonitorCheckBox = 0x805250e, 
              buttonBox = 0x80500ec}, <No data fields>}, 
          static staticMetaObject = {d = {superdata = 0x805e5f4, 
              stringdata = 0x805a740 "QPulseAudioDeviceChooser", 
  data = 0x805a7c0, extradata = 0x0}}, _qpulseAudioDeviceModel = warning: can't find linker symbol for virtual table for `QPulseAudioDeviceModel' value
warning:   found `PROJECTM_MODULE_EXTENSION' instead

{<QAbstractListModel> = {<No data fields>}, static staticMetaObject = {d = {
                superdata = 0x805e540, 
                stringdata = 0x805aa60 "QPulseAudioDeviceModel", 
                data = 0x805aaa0, extradata = 0x0}}, _devices = @0xbffff2c8, 
            _devicePosition = @0x1009d35}, _qpulseAudioThread = 0x1009b35}
        ret = <value optimised out>


LGDN