Log connection Files missing

I suspect someone hack my teamviewer. Today I saw teamviewer program opened after lunch, but I don´t remember to have left it running on screen. I looked at main log file but I can´t see if there was some irregular activity or just regular stuff. The connection log files are missing.

I tried to set teamviewer to log both incoming and outcoming connections in advanced options, but it is not working. I tried also to uninstall e re-install teamviewer but it didn´t workout.

Is there any register key to set in windows register to get this work?