PQL problem

I am trying to run PQL on a MacBook Pro laptop running OSC 10.6.8 (snow leopard). I installed the latest version of the PASSCAL software for this OS first, then downloaded the PQL version for snow leopard and did both the install and configure All that seemed to work fine. However, when I try to start PQL (by typing "pql" and returning) I get this message: gdbm fatal: read error and it stops (no display or anything). I tried reinstalling but go the same results. No idea why. Any suggestions? Thanks