After update to 2.2.0.3 no scheduled taks are running any more

I am using Duplicati on a Windows PC for a long time and I have setup several scheduled backup tasks to run every Saturday in the morning around 7 o’clock. This means when I start my PC some hours later, the scheduled tasks will run.
This worked fine until I did update Duplicati to version 2.2.0.3 (from 2.2.0.1). Now the scheduled tasks do not start any more and in the WebGUI its shown that the next run should have already happened.

Has anybody an idea how I can repair my installation?

Thanks and regards,
Andreas