Once I installed Flash Player 9.0.124.0 (from 9.0.115.0) FOP panel stopped working. After uninstalling 9.0.124.0 and re-installing 9.0.115.0 from Adobe archive the FOP panel started working once again. After looking at the network traffic from the 9.0.124.0 and 9.0.115.0 case I noticed the following:
With the 9.0.115.0 player, the FOP panel would initiate two connections to the FOP server at port 4445. In the case of the 9.0.124.0 player, only the first connection would be done and it would be identical as the first connection with the 9.0.115.0 case.
I have reported this to Adobe but I don't have a support agreement with them so if anyone does they may have more pull then me.