Imac Lion wifi and 4OD issues

[Andythed]

Hi

I have a 27" imac.

I use 4od a lot. Its a uk tv channel which streams its programs via flash.

I keep getting programs stopping. When I press play it does start again, but the image it gets stuck on stays in the top left corner.

Also been having wifi problems since installing lion (only did it to get brightness adjustment in mdp input). Is that related?

Any suggestions?
Thanks

Andy