The save and apply button is not working any longer after upgrading the version to 2.288.
When clicking at the save button it happens nothing at all and with clicking apply I get the error pop up with no content (which is very helpful to find the issue and a solution).
It appears that with a working jenkins version a POST request with /configSubmit is getting fired if the apply button is being clicked. But I do not see such a request with the not working Version 2.288. I also tried it with different browsers and none seems to work.
For me this is very critical because I need to reboot/relaod the jenkins every time after making some changes and those changes are only possible if I do them directly in the config file. I can't create new jobs either because I can't save them.
The only case where the save button seems to work is when changing some userpermissions.
Is this a bug in the software or what do I have to do to fix this?
A quick reply would be very much appreciated.