From time to time i hear clicks in the audio while it's sure not to be an overload of the CPU processing power.
The cause may be outside MuLab. Try lowering the priority or completely disabling things like Spotlight. Search the web for more details from MacOS system experts.
A crash occurred. Where can i find the crash technical details?
To find the crash details there are 2 cases:
1) If you see a MuTools red alert box from MuLab, then the crash details should be in the MuLab log file.
2) If you don't see a red alert box from MuLab (but rather a Windows alert box) then you can find the crash details via Windows Event Viewer -> Windows Logs -> Application.