I have two RadioGroups on my form, each with just two RadioButtons. When I click a button in one group, it turns off the "on" button in the other group. What could be causing this? I'm using D2007 with Vista.

I you have the OnClick event for you radiogroups,check if it does not include the other radiogroup in your instructions, if not add a code on the acitive event of a form and set the itemIdex of each radiogroup and then on the OnClick event of each radiogroup set the other radiogroup index as desired, I hope this will solve your problem.