Hi Shane, admittedly, moving members and/or having lots of existing content doesn’t happen that often, but more and more. I’ve certainly gotten rid of my fear of the database these last few weeks! I used an SQL-query (tried both from the CP and PHPMyAdmin, no difference, really) to search-and-replace the group ID’s.
Another site I’m working on at the same time had 12.000 members in a csv. That was a little bit more tricky, because of the memory-limit. I figured the parse error came on file-sizes around 350-400 kb. So I split the import into around 2000 members each. Another headache with that one was using Zoo Visitor for member profiles and such, but with DataGrab and Zoo Visitor’s built in sync it worked in a way.
All my members are now living comfortably in their new homes, so consider this thread solved!