Push-to-Talk key doesn't work properly in the latest snapshot (1.2.4-beta1-48-g242af40). My specific PTT key is Numpad Del - with Suppress enabled, only works if Mumble is focused. With Suppress disabled, works normally.
In previous mumble versions (actually even the previous snapshot) my PTT key worked as expected.
Not sure if dxdiag.txt is actually relevant in this case, but attached anyway in case it's important.