The error seems to lead to a DB issue on the "view" data, so the logging database.
Given that you see the problem both in ACS 5.1 and 5.2 it may be that the DB backup is corrupted.
I would not recommend TFTP to backup/restore the ACS DB as I saw in the past problems where a big backup file as the ACS one can be truncated if the TFTP server doesn't support file tranfers bigger than 32MB.
You can confirm if this suspect is correct by checking the size of the file.
If this suspect is confirmed, I'm afraid that you should use a different backup file (if you have a working one).
On the other hand, if that doesn't seem to be the case I would suggest to open a TAC Service Request to further investigate this.
first of all: many thanks for your reply. I found the problem by myself some days ago and you're pointing with your remarks exactly in the same direction. I checked the logfiles - I'm backing up the configs on a scheduled basis via FTP but restored them via TFTP which led to the mentioned problems (ACS processes not starting up again).
I them reoladed the file using FTP and everything was just fine.
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We have configured the outside and inside Interface with official ipv6 adresses, set a default route on outside Interface to our router, we also have definied a rule , which also gets hits, to permit tcp from inside Interface to any6.
In Syslog I also se...