4
Thank you guys for your feedback.
Luckily I installed 2.5.0 in a new database and in a different folder. So I had my old site still running, but I was unable to access it.
Clearing the protector xoops_lib/modules/protector/configs/ folder solved my logging in problem. In PHPmyadmin I saw a line in the database with my username and IP and 'brute force attack'. Maybe changing the login form (I was editing my theme while this login problem occurred) caused this. I don't know.
End of the line I was able to log in to my old site. Downloaded the templates as .tar.gz file. First it seemed corrupted, but I managed to extract it with
MuCommander. I will add them to my 2.5.0 site and see if everything is back to normal this evening.
I'm posting this during worktime... I will try if I can log in to xoops.org from home this evening. I was wandering if protector blocked me also out of xoops. Is protector using a cloud? But first let me try to log in on xoops.org from my home IP this evening. I'll keep you guys updated.
Again I'd like to thank you all, now I'm having a good day :)