I encountered a situation when starting up Google Drive failed in few seconds without evident reason. I just saw disabled Google Drive icon for a while and then it disappeared. I found logs sitting at \AppData\Local\Google\Drive\sync_log.log location and there was:
2014-09-30 21:20:37,013 +0200 INFO pid=4864 9492:MainThread logging:1612 Setting Omaha usage flag in registry 2014-09-30 21:20:37,013 +0200 ERROR pid=4864 9492:MainThread logging:1586 ERROR, UNEXPECTED EXCEPTION 2014-09-30 21:20:37,013 +0200 ERROR pid=4864 9492:MainThread logging:1586 (5, 'CreateEvent', 'Access denied.') Traceback (most recent call last): File "<string>", line 249, in Main File "common.wx_sync_app_controller", line 115, in Initialize File "common.sync_app_controller", line 145, in _RunAsyncCallbackWithExceptionHandling File "common.wx_sync_app_controller", line 131, in _InitializeAsync
File "windows.win_sync_app_controller", line 155, in _InitializeEvents File "windows.win_sync_app_controller", line 249, in _CreateEvent error: (5, 'CreateEvent', 'P\xf8\xedstup byl odep\xf8en.') 2014-09-30 21:20:37,015 +0200 INFO pid=4864 9492:MainThread logging:1612 Crash reporting disabled. Ignoring report. 2014-09-30 21:20:37,016 +0200 INFO pid=4864 9492:MainThread logging:1612 Exiting with error code: 0
Not very helpful. Though I found some discussion about possibility to install Google Drive multiple times on single computer. I am the only power user on my notebook so I know that this is not the cause because there is just single installation. But I logged in my wife’s account and there was the Drive running (but not configured). So I stopped the process and returned to my account. Next attempt to start Google Drive was successful. So I found there can be single Google Drive process running on a computer.