I am a DIY guy and have programed this remote before without issue. Got a new cable box, tossed all the old connectors and went to HDMI. I have gotten through naming devices and setting up the IR databases (all work under "test" mode from the MX Editor) however when I try to download to the remote I get
a Microsoft Error -

"MX Editor application has stopped working...windows will close the application..."

This only happens with the program I created. I can download the demo program without issue.

Asside from the obvious (create a new program and try again) I'd rather not waste the time if someone has any ideas as to what went wrong

This is about it. Being a DIY URC isn't going to help (like they could anyway!). Start from scratch and save as you go.

Yeah, I figured as much. I went ahead and re-programmed. Much faster this time as I did not have to remember how to do it. Thanks - works like a charm

I don't know why this happens but it's something I've experienced with them a few times.