I made a new script that i can run so i see better when my microphone get automuted.
Posting it first here, so other can try it first. mabey it need some changes. want to put it on the marketplace. The text dissapear automatic after a short time, or when you unmute yourself.
You can download it here http://market.simsquaremetaverse.nl/scripts/SQ_MicrophoneMutedAlert.js