I have this subalbum with the wrong name 'ceci n' inside an album called images. Deleting it through admin or ftp works, but then I can't access the rest of the albums anyomore inside the main album images. The page goed blank if I try to do that. when I look at the source code the html stops at div Content.

I'm using the latest version and also deleted all the cache.

Any errors in Zenphoto log or server log ?

If you get blank page you should always first look into the logs. Also please try a database refresh on the admin overview page. If you delete via ftp the albums folder might be out of sync with the database.