Ok i posted a few days ago, because my Zope was crashing. I found, that working concurrently in Versions is NOT good with the Core Session Tracking, because the internal DataContainer is modified via the ZODB and crashes through the versions. I told my people to work one day without any versions, so we managed versioning by talking to another who is modifying what. This day zope did not crash at least one time. I had the same encounter with the ZPoPyDA (possibly EVERY DA?) and found that there are things being modified through the ZODB and if you do so in concurrent version ... hmm you know ... locking problems. Any comments on this? -- Christian Theune - ct@gocept.com gocept gmbh & co.kg - schalaunische strasse 6 - 06366 koethen/anhalt tel.+49 3496 3099112 - fax.+49 3496 3099118 mob. - 0178 48 33 981 reduce(lambda x,y:x+y,map(lambda x:chr(ord(x)^42),tuple('zS^BED\nX_FOY\x0b')))