It's true that you have to have a clean machine to run it, and although you might have cleaned your flash, etc. the people you play against have to do it, too. Have they? How do you know that? It would be a good thing to take WGTdbloshoe's advice and suggest to them that they do.
If you take 3 minutes, it works fine as I have very little problems and need no assistance.
People make up excuses that WGT is at fault but imagine that the users aren't taking the simple, basic steps necessary to run the game at it's proper performance. Play the game for the flash based game that it is.