Mouse pointer not changing to correct function

Hi, I’m experiencing the same strange behaviour since I’m on Mac. My Win workstation is fine but both my MacBook Pro and my iMac behave strange in terms of this mouse pointer graphic mismatch. It happens now and then and seams more often on heavier projects. Sometimes also the angle bottom handles of the audio parts are missing and I can resize or modify the audio part.

Any ideas are welcomed.

Thanks.