It appears to be both a Xerox AND a FMP issue. Other drivers work fine with FMP11 and the Xerox drivers work fine with other applications (including older FMP versions).
I had the same problem with a WorkCenter 7335. Xerox just released an update (Feb 2011) that resolved this issue for my printer. The drivers for the 7232 still appear to be a little older (check to make sure you have the latest).
Prior to the update from Xerox, there were some workarounds that helped get work done. They are all documented here:
FileMaker 11 not compatible with new Xerox WorkCentre 7425
Cheers,
Lyle Millander