Memory leak when testing on flash player 10?

I’m quite confused on what differences there can be between different versions of the flash player. Since I started coding my last game I’ve been testing it on chrome and firefox with good results (flash player 10.3.xxx). The memory needed to run it is always around 20 MB and also the cpu usage is pretty low. Also with the player 11 beta on ie the memory needed is around 50 Mb. But when i try to test it on the flash player 10 something is not working, the memory used by the game keeps growing and the garbage collection seems to be in holiday. Can this be related to the fact i’m coding it with the last cs5 (in as2)? Or since it’s a board game i needed some listeners that could create this problem?