I have two similar DBs. If I process one (attach, select, update,
detach), exit the app, restart, then process the second, everything
works fine. If I try to process both DBs without exiting and
restarting, the app hangs in isc_dsql_execute() when attempting the
update on the second DB (the selects on the second DB work fine). The
call stack is

NTDLL! 7c90eb94()
KERNEL32! 7c80a075()
FBCLIENT! 015165d1()
ff006aec()

which to me is not very helpful. Is there something I should (or
shouldn't) be doing in this situation? Is there any mechanism within
FB that will help me track the problem?

Thanks!