After around 2 month the problem is solved
http://www.symantec.com/docs/TECH159962
and a hotfix is available, but unfortunately only for BE 2010 R3, and not for the R2 build:
http://www.symantec.com/docs/TECH161270
Hello,
we had the same problem with both versions, 2010 R2 SP1 and also with R3.
Very interesting that we have the problem only if we make the (recommended) backup to disk.
If we backup to tape, we then can open the AD part in restore selections with...