I was just trying to open casino flash versions following links from your websites on your signature and I did not noticed any problems in IE running SP2. I tried a few casinos, and the windows opened well and with the affiliate code in it. I did not try all, but since what I tried, opened well, the others you’re speaking about must also open well. They must see what the problem is. (I tried most on Vegas Affiliate network)
I did notice problems with Firefox. Most of the flash versions did not open, reporting unsupported browser. I don’t know why is this error reported since flash is supported in Mozilla in general. This is a concern since Firefox is growing in use, and you may lose a lot of players, because after seeing the error in Firefox, they may open directly a IE window and go directly to the casino website without your affiliate tag.