hi, I tried winswitch on a wheezy install, I had to :

• install manually python-appindicatore
• changing tray_icon_name for winswitch_indicator, as winswitch_applet file does not exist, and is not in ALL_BUILTIN (ui/icons.py).

Thx for your work, cheers, rémi

As originally reported ​here on the mailing list, here is the backtrace obtained with abrt.

Note: contrary to the report above, when I test this only happens on KDE, and only when using "auto-start".

abrt_version:   2.0.10
cmdline:        /usr/bin/python /usr/bin/winswitch_applet --open_server_config=
executable:     /usr/bin/winswitch_applet
kernel:         3.5.2-1.fc17.x86_64
time:           Wed 29 Aug 2012 11:30:08 PM ICT
uid:            1000
username:       fedora

backtrace:
:warnings.py:29:_show_warning:ValueError: I/O operation on closed file
:
:Traceback (most recent call last):
:  File "/usr/lib/python2.7/site-packages/winswitch/client/client_base.py", line 744, in server_dir_changed
:    self.slog("evt_type=%s" % type(evt_type), monitor, d, ignored, evt_type)
:  File "/usr/lib/python2.7/site-packages/winswitch/util/simple_logger.py", line 317, in slog
:    self._write(self.log_colour, "II", self.prefix, msgsig(msg, *args))
:  File "/usr/lib/python2.7/site-packages/winswitch/util/simple_logger.py", line 231, in msgsig
:    s = msig(*args)
:  File "/usr/lib/python2.7/site-packages/winswitch/util/simple_logger.py", line 214, in msig
:    return	"("+(','.join([str(v) for v in args]))+")"
:  File "/usr/lib64/python2.7/warnings.py", line 29, in _show_warning
:    file.write(formatwarning(message, category, filename, lineno, line))
:ValueError: I/O operation on closed file
:
:Local variables in innermost frame:
:category: <class 'gobject.Warning'>
:filename: '/usr/lib64/python2.7/site-packages/twisted/internet/gtk2reactor.py'
:lineno: 277
:file: <closed file '/home/fedora/.winswitch/client/applet.log', mode 'a' at 0x7fdde6333f60>
:line: None
:message: Warning("g_object_set_qdata: assertion `G_IS_OBJECT (object)' failed",)

xpra hasn't been working the last few updates.
Checked the server log, and it showed:

[EE] 2012/10/09 19:00:14 WinSwitchServer.assign_virt_utils() failed to load xpra, make sure it is installed: No module named xpra.dotxpra

Fixed that with sudo ln -s /usr/lib/xpra /usr/lib/pyshared/python2.7/ but I still can't start an xpra session.
Server:

[DD] 2012/10/09 19:12:50 WinSwitchClientChannel.start_session(afd2118e252a679a88ea6e030680402d,xpra,,read_only=False;encoding="";,None) options={'read_only': 'False', 'encoding': '""'}
[II] 2012/10/09 19:12:50 WinSwitchClientChannel.start_session(afd2118e252a679a88ea6e030680402d,xpra,,read_only=False;encoding="";) command=Command(LXTerminal: lxterminal), user=User(Administrator : f629f85ae9424587bea966f155801421)
[II] 2012/10/09 19:12:50 WinSwitchServer.start_session(User(Administrator : f629f85ae9424587bea966f155801421),xpra,Command(LXTerminal: lxterminal),,{'read_only': 'False', 'encoding': '""'},None)
[DD] 2012/10/09 19:12:50 WinSwitchServer.real_start_session(User(Administrator : f629f85ae9424587bea966f155801421),xpra,Command(LXTerminal: lxterminal),,{'read_only': 'False', 'encoding': '""'},None)

Client:

[II] 2012/10/09 19:12:03 WinSwitchApplet.do_start_session(ServerConfig(hostname.net:346729663014),Command(LXTerminal: lxterminal),xpra,None,None,False)
[II] 2012/10/09 19:12:03 WinSwitchApplet.attention(Starting LXTerminal,None)
[II] 2012/10/09 19:12:03 ServerLineConnection.do_message(f629f85ae9424587bea966f155801421,Cannot start session,You have requested an xpra session but this server does not support it,)
[II] 2012/10/09 19:12:03 WinSwitchApplet.do_notify(Cannot start session,You have requested an xpra session but this server does not support it,None,None,info,ServerConfig(hostname.net:346729663014),)
[II] 2012/10/09 19:12:03 win32_balloon.notify(5112608,Cannot start session,You have requested an xpra session but this server does not support it\nClick to Edit Server Configuration,5)
[II] 2012/10/09 19:12:03 WinSwitchApplet.attention(Cannot start session,None)
[II] 2012/10/09 19:12:03 Win32Tray.MyWndProc(5112608,1044,0,1026) NIN_BALLOONSHOW

This was with: Server: Ubuntu 12.04 64bit, Client: Windows 7 64bit Both are running v0.12.16

$ dpkg -l winswitch xpra
ii  winswitch                                  0.12.16-1
ii  xpra                                       0.6.0-5