Closing the main GUI doesn't make the application return

[krichter722]

Invoking python ./guiminer.py and closing the main application window causes the GUI window to disappear, but the application to hang for > 30 minutes (after that I sent SIGTERM). This is independent of whether mining has been started or not. It might be related to the fact that no graphic card is detected in my case. The output of python ./guiminer.py is

$ python ./guiminer.py 
['/mnt/DATA/sources/poclbm', '/usr/local/lib/python2.7/dist-packages/Electrum-1.9.8-py2.7.egg', '/usr/lib/python2.7/dist-packages', '/usr/lib/python2.7', '/usr/lib/python2.7/plat-x86_64-linux-gnu', '/usr/lib/python2.7/lib-tk', '/usr/lib/python2.7/lib-old', '/usr/lib/python2.7/lib-dynload', '/usr/local/lib/python2.7/dist-packages', '/usr/lib/python2.7/dist-packages/PILcompat', '/usr/lib/python2.7/dist-packages/omniORB/COS', '/usr/lib/python2.7/dist-packages/gst-0.10', '/usr/lib/python2.7/dist-packages/gtk-2.0', '/usr/lib/pymodules/python2.7', '/usr/lib/python2.7/dist-packages/ubuntu-sso-client', '/usr/lib/python2.7/dist-packages/wx-3.0-gtk2']
./guiminer.py:38: wxPyDeprecationWarning: Using deprecated class PySimpleApp. 
  app = wx.PySimpleApp(0)
./guiminer.py:39: wxPyDeprecationWarning: Call to deprecated item 'InitAllImageHandlers'. 
  wx.InitAllImageHandlers()
ERROR:root:Failed to load taskbar icon; continuing.
DEBUG:poclbm-gui:Loaded: {"profiles": [{"username": "username", "balance_auth_token": "", "name": "Default", "hostname": "api2.bitcoin.cz", "device": 0, "affinity_mask": 1, "flags": "", "autostart": false, "external_path": "", "password": "pass", "port": "8332"}, {"username": "**********", "balance_auth_token": "", "name": "WeMineLTC-NVIDIA", "hostname": "127.0.0.1", "device": 0, "affinity_mask": 1, "flags": "", "autostart": false, "external_path": "/mnt/DATA/sources/poclbm/miners/puddinpop/rpcminer-cuda.exe", "password": "**********", "port": "8332"}], "bitcoin_executable": "", "window_position": [1006, 542, 585, 299], "show_summary": false, "show_opencl_warning": true, "console_max_lines": 5000, "start_minimized": false, "blockchain_directory": "", "show_console": false}

(replaced username and password with **********)

experienced with 5c6b314b63573b005c647110bdd64431b4ebee7f