Hi,

we have switched to WO 5.4.3 (from 5.2.3) several months ago. And since that 
time, we sporadically experience strange exceptions, mostly 
NullPointerExceptions deep within EOF, most of which could be traced back to a 
snapshot mysteriously vanishing.

I had this in the debugger once, and drilled down to all the snapshots in the 
EODatabase, and there was one entry missing. Interestingly, this was from an 
entity which is readonly and cached, and also that entry had to have been there 
before, otherwise the app wouldn't have gotten to the point where it failed. I 
checked the DB and the value was there. It is from a table which is only used 
for lookup and never changes.

This also happened with other snapshots of regular entitites, and we have never 
really been able to reproduce it reliably. It seems to happen when lots of ECs 
are involved, but that's only an assumption.

Has anyone ever seen something like this? Can this be related to the WO 5.4.3 
switch? I remember some talk about open bugs in 5.4.3, but haven't been able to 
find anything substantial about it.

Btw, no WOnder (yet, sniff)

Thanks,
Marc

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