UiPath closes automatically when I start running a robot

After the last update I am not able to run a robot anymore. When I click the play button in Uipath, the robot starts running for a few seconds and then closes UiPath automatically.

The UiPath logo remains visible in the task bar but I cannot click on it. The only way to close UiPath is via ctrl-alt-del and then the task manager.

DId anyone face the same problem?

Meanwhile I have send my robot to another computer, on that one everything worked fine.
Also I un- and reinstalled Uipath. Still got the same problem. Any ideas?