i upgraded to version 184.108.40.206 this morning. My AIM sounds no longer work now. I go to Options/Settings/Sounds...nothing is muted...and IM&Chat Sounds are set to play imrcv.wav and imsend.wav
Can you try reinstalling the program?
Other people asked questions on similar topics, check out the answers they received:
Other people asked questions on various topics, and are still waiting for answer. Would be great if you can take a sec and answer them