Complex Access 2000 query after REQUERY vs. Win NT

Gents,

I have a quite severe problem with MS Access 2000.
There's an incredibly complex query on a form with function calls, and pointers to certain text field on the form to filter out only user specific records.
When the user makes any modification on the filter criteria I execute the FORM.REQUERY method - obviously.

This works fine on Win2K or WinXP systems but Access seems to stop responding on WinNT systems. If I check the processor utilization MSACCESS.EXE takes 99% of processor capacity. There’s something more interesting; If I save the query and run it independently it work fine even on NT. If I call the query from the form it dies.
Win2K, XP, and NT has JetEngine 4 SP7 installed.

Any idea where's the problem?


Thanks in advance.