We have installed on a few different servers and tried to catch as many bugs as possible but obviouslythat doesn't quite catch everything. Different browser/server combinations, php versions, settings etc. can always bring up new things that are being worked currently. For example, the cookie one only appears on certain browsers. Another factor is this is pretty much a total redesign/rewrite of a very large portion of the code so many bugs won't be caught until it's really put to the test by a variety of users. There are still alot of reported bugs in the system that are in the first beta, so if this is something that you are on a deadline I would highly suggest setting up the stable version.
As for the problems with the import, I'm not familiar with the ubb import script so will need a comment from another staffer on this part.
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Rick Baker
UBBThreads developer
