Prl_err_not_enough_perms_to_open_authorization_fil e

What's that? It happens when trying to start Parallels (which then doesn't start). Often rebooting mac os x helps. I suppose some permission turned bad on some Parallels files. Though uninstalling / re-installing didn't help (problem came back today).

What should I check?
What permissions should I check on which files?

 

The log actually showed this:

10:01:47.792 F /prl_common_utils:477/ ParallelsDirs::Init( ) was called. Current app mode = 1
10:01:47.822 I SGAC/gui:477/ Process Serial Number: {0, 213044}
10:01:47.823 I SGAC/gui:477/ Initialized: Shared Guest Applications dispatcher
10:01:47.885 F /gui:477/ Creating Mac menu bar...
10:01:47.890 F /gui:477/ RLIMIT_NOFILE changed to maximum: 4294967295
10:01:47.890 I CPTOOL /gui:477/ {init @ CPInit.cpp:34} CPInit initialization...
10:01:47.892 I CPTOOL /gui:477/ {init @ CPInit.cpp:51} CPInterceptor::Initialize returns 1
10:01:47.892 I CPTOOL /gui:477/ {init @ CPInit.cpp:55} CPInterceptor::Start returns 1
10:01:47.905 F /gui:477/ Patching Preferences menu...
10:01:47.905 F /gui:477/ Patching Quit menu...
10:01:47.906 F /gui:477/ localhost status: connecting
10:01:47.917 F /gui:477/ Patching About menu...
10:01:48.161 F /disp:163/ Processing command 'DspCmdUserLoginLocal' 2040
10:01:48.163 F /pvecontrol:477/ Could't to open checking legacy file '/tmp//{8d636a15-9ef4-420f-9e15-5c8ab1494867}'
10:01:48.186 F /gui:477/ localhost: received result for [DspCmdUserLogin]. RC = [PRL_ERR_NOT_ENOUGH_PERMS_TO_OPEN_AUTHORIZATION_FILE]
10:01:48.189 F /gui:477/ Showing message box. Type = [Warning, PRL_ERR_NOT_ENOUGH_PERMS_TO_OPEN_AUTHORIZATION_FILE]
10:01:50.053 F /gui:477/ (!)Error: login failed.
10:01:50.054 F /gui:477/ Application is about to quit. Now we need to check all the windows and ask user if he wants to cancel exit.
10:01:50.054 F /gui:477/ Exiting application...
10:01:50.054 F /gui:477/ localhost status: disconnected
10:01:50.055 I CPTOOL /gui:477/ {deinit @ CPInit.cpp:67} CPInit deinitialization...
10:01:50.058 I SGAC/gui:477/ Deinitializing: Shared Guest Applications dispatcher
10:01:50.058 I SGAC/gui:477/ Deinitialized: Shared Guest Applications dispatcher

So I had a look at:
/tmp/{8d636a15-9ef4-420f-9e15-5c8ab1494867}

That file existed and there were a dozen of those (size 0 bytes). I deleted them.

Parallels Desktop now starts without issue.