Avast Free 8.0.1489 i need help with BF3

i have Avast Free 8.0.1489 with windows 8 64-bit.

When i disable avast i can see bf3 pc ping and play but when it on ping not avail and i cannot play plz help me???

wow no help on this??

Update to 8.0.1496: http://forum.avast.com/index.php?topic=131804.0