Some games, for whatever reason why i don't understand, don't allow autoclickers. Not saying that my clicker is running too fast, it just seems like the flash game is able to detect that it's not me physically moving my mouse and it's me actually emulating clicks. w0t do?
i ran into a game like this a long time ago. the solution was to make a loader in VB.net or something similar, and then code your bot/autoclicker in actionscript. so you load the game swf, then your custom swf to interact with the game.
edit: the "no emulated mouse/keystrokes" was directly embedded into the flash player for that game, so you might not have to go that far. if you can find where in the swf it is, you could probably make an AoB to disable it