Modules didn't work

Hi guys,

i think that problem is since the latest update.
If I open a new module, no matter which module, if i save it, i automaticly come back to the module overview page without any saving or the new module.
The module page is also really slow loading.

My first steps to fix:
empty cache
renew cache
empty browser cache
check another browser

But I allways got the same result after pressing the save button. same with "save and close"

Could you help please?

best regards,

Michael