Incorrect integer value: 'männlich' for column 'gender' at row 1

odd enough, there really is no field referencing "gender" in "tablecolumns" of _comprofiler_fields
What I have done is to update cb_geschlecht.
The values are now 1 and 2, and the description is now männlich and weiblich.
So text gets displayed, and internally comprofiler uses integer values.
This configuration produces no error messages when users update their profile

Not sure why it suddenly decided not to work anymore, but it does now again. Thnaks for your time and support on this.

My guess is you're synchronizing that field to something else and that something else is what is throwing the error. So for example mapping it to Kunena's gender field in CB Forums, but that does int casting so that likely isn't it, but gives you an idea of what I mean.