Hi Gertrud
I assume you have first deleted your environment as described in my first post and checked the table entries ?
The problem we faced was that there were non BPC objects referencing some of the elements which had been deleted (e.g., they existed as reference objects in other InfoObjects, were in DTP's used to report BPC data in BW etc). It was rather rash but I deleted all these as a last ditch attempt to get it working as it did.
Try searching for any specific technical names which cause problems on the error log to see if they are referenced elsewhere.
You can also try what I did (again, in the first post) but restoring an environment not in Dev. This will determine whether it is definitely a problem with some elements 'hanging around' for your main environment.
Let me know how you get on.
Ian