Mumble Overlay

So I'm having major issues with Mumble since I installed it. Basically for no reason I couldn't run Tribes before Mumble was open or somehow they would conflict and Tribes would completely crash and burn. That has been resolved though by some unknown means, any way my key problem is the overlay. I have the overlay set up where and how I want it, but it won't display in game. The only thing I can think of is my resolution ( I play on a relatively low res for better FPS) but even so I'd placed the overlay in the middle of the page and still got nothing.

So if anyone is a mumble expert please explain this to me... I've usually got like 10-15 people in my server at once and have been trying to sort who's who just by voice. Not something you want to be doing in comp play.