Muble SL channel

[sirfstar]

Basically everything is fine - i can talk in a squad, i can talk with SL's with a numpad, i can talk with a CO.
Except one thing - no one can hear me in SL channel, but if i press the assigned button i can see my speech icon is being red. (i can hear everyone in SL channel and i am SL)

Tried different keys. What could cause this issue?

[Mineral]

are you sure you are talking to SL and not to commander?

[sirfstar]

upd: not really sure.

is that right?