4
I actually found a link to another page in another post in this forum
https://sourceforge.net/tracker/index.php?func=detail&aid=1247454&group_id=41586&atid=430840
I accessed the xoops_config in the databse and found the referenced DEBUG part.
Mine was already set to "1" ... so switching it to "0" fixed my problem.
At least I can access everything
Hopefully it will all work right now