I actually try the snapshots of Mumble, especially because of a better overlay support on my system than the stable 1.2.2.
There is a small problem. The snapshots get a new overlay system, who is really not bad. But unlike the old overlay system, there is no more way to make it grow UP instead of down. It is down only, or I didn't success to find the option, so I can only set up the red dot to reduce this limitation, as I prefer see it growing up.
Can you tell me where this option is, or if it is leaking, if it will be added in the future ?