I'm trying to enable the Mumble overlay when I use EVE Online but it seems I'm not be able to achieve this result.
On Mumble the overlay is enabled, I launch Mumble first and then Eve Online but no overlay on Eve screen.
I also tried with the -nod3d9ex, same result: no overlay.
I've got the very same issue on Star Wars The Old Republic.
I'm running Windows 8 Pro x64 and the latest mumble snapshot version 1.2.4-91-g15ecb7a