This is probably a difficult question to ask because I can't give a lot of information. When I open the edit screen in the admin-side of a module, it's being shown for a split second and then the page refreshes to a blank page with a select field.
I already tried to uninstall the admin template and reinstall, but the issue is still here. It happens with any admin template that I tried so far except the oldschool Hathor admin template.
I have no idea where to look for the problem. I hope someone else encountered this issue before and has a solution ... or at least has an idea where to look.
Tell me if there is any information I can give to help clearify my question.
p.s. I am running the latest Joomla version (3.6.5).