Anybody seen view corruption on big view indexes?

Hi,
I am having difficulties in running R6.51.
We are testing our application right now and I see
_very often_ these errors in log.file, while R5.0.12 runs fine:

15.04.2004 04:00:49   NIF: DETECTED STORAGE CORRUPTION ERROR 'This 
database cannot be read due to an invalid on disk structure'
15.04.2004 04:00:49   NIF: in /local/notesdata/xxx/doc.nsf collection 
"Web\PlÀne\Ablage Eingang|webvwPlaeneAblageEingang", ID=2663150 length 
53248
This only happens on big databases if size of .nsf goes beyond 2GB and
the view itself gets over 500MB.

Smaller databases run fine.
I can rule out a possible hw defect, as I don't see any kernel messages 
and it's happening on a couple of servers.
Transaction logging is enabled, and it does not seem to make a 
difference if I check this view to be transact.-logged, too.

Tia
Rainer