The toolbox didnt help in my case...
I fixed the issue by replacing the strings in the db. Here what I did:
1. I customized the following entry in table "sfmeta":
meta_type: profile
meta_key: tabs
There we have a serialized entry. To edit the slugs, I used this tool (do not just replace string in the serialized entry. It will break then):
http://interconnectit.com/prod.....databases/
Just upload this tool to the root directory of your website and navigate to the directory in your browser.
2. Check the url in the form-tag of your website and search with the tool above for the string after "form=". This is the string to be replaced.
3. I got the right strings from the file /wp-content/plugins/simple-press/forum/profile/ajax/sp-ajax-profile-save.php. Here you see the correct slugs after the "case: ". Copy the depending string to the replacement field at the tool.
4. Select only the table "sfmeta" for the replacements and make a dry run (nothing will be replace). There should be only one result. Now you can check if the replacement was correct. If it is correct, you can run the live run.
5. Repeat this replacement for every string (step 2-4).
6. Delete this tool again! It is public and everyone can change everything in the database if you keep it online!
7. Make a copy of the db entry. If it breaks after the next update, you can replace the serialized string if there are no changes because of the update.
As a long term solution we could make a php functions to unserialize the string, search and replace the depending slugs and overwrite it again. And maybe there is even a hook to automate this. For sure not the cleanest solution. But until we know where this issue comes from this would help...