This is a serious problem that does not effect all users, however. We believe this is a problem with windows vista. A solution could be to upgrade to windows 7, but that may not be neccessary. At this point in time we will continue to work to fix the problem.
WE FOUND A SOLUTION. It was indeed a vista problem. all you need to do is right click on SA-MP, and click properties than run it as an administrator. You may have to re-add servers to favs after doing this, and also. make sure you change it to run as windows xp.
Status: Solved.