Thanks, Jim, and sorry for the delayed response. (I've been out of the office an another project). It looks like we've found a work-around for the problem. If we add the identical actions to the "On Mouse Down" option (in addition to "On Mouse Click"), then the buttons respond properly. Unfortunately I'm not allowed to send out any part of the project (mandate from the upper echelon), but at least we have a solution that works for now. I am a little curious, though, to know if anyone else has run into the same problem.