lights wont turn on using vera on windows

I’m sure i am not the only one experiencing this problem and hopefully there’s a quick fix. Basically i have three computers in the house 1 mac and 2 PC’s running windows vista, on the mac when i click a button to send a command to a light (on,off,dim) in Vera it always works no matter what browser i use. On both PC’s it will usually work a couple of times after what it just stops sending command but the buttons when clicked will turn orange and stay orange, so i can end up with both on,off buttons orange as if they were both activated at the same time. This happens in all browsers under Windows so it seems to be a problem related to the OS and possibly as something to do with flash. I also run SQ connect on my iPhone with perfect result so i know its not a hardware problem.

Im running 1.1.319

Any ideas what could be causing this?