>I checked my cobmo boxes row and control source properties, there is no problem there. When I set the breakpoint in the debugger, it stopped right after executing the refresh call.
>I have several combo boxes that have record sources types of 'alias', none of which are the main table that I am having the trouble with. All of my 'tables' are actual tables with no filters set on any of them. My main table has a regular index set to the primary key field, and the other tables that are used as the source for the combo boxes have relations set back to the primary table.
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>Thanks for all of the suggestions.

Try setting your breakpoint on Refresh, and step through the refresh code, be sure to step into method/functions that are called. That's GOT TO find the culprit!