New to Lemur... Help w/Program Change Issue

Hello,

I've setup several custom buttons and pads that send program changes. Everything works fine... but only once. For example, I press the button for PC 1, then PC 2, etc. The correct program changes are sent and received properly.

Here's the problem: I then press the button for PC 1, and nothing happens. Same for PC 2, etc.

There's probably something very simple that I'm overlooking, but after spending several hours reading and trying new things, I'm still a bit stumped. Thoughts?

Thanks!