Very Weird-Banner Shifts on Button Rollover

Hey guys. I have a jpg background on my site. The nav buttons are on top of it, underneath the banner, and the sub-nav buttons are underneath those. When I mouse over my main buttons, the sub categories shoot onto the screen from the left. The problem is is that when you first roll over the main button, right when the sub nav starts to shoot out, the banner at the top glitches for absolutely no reason. It also seems to do it very briefly as soon as the file is opened. Even weirder still, it only does it when the swf file is opened outside of Flash, and doesn’t do it at all when hitting ctrl + enter in the program. It’s very strange looking and I have no idea why it could be doing this. Attached is my swf, so please take a look and see if you can pick out the problem. Thanks in advance.

I believe that in another thread, this has been discussed, and apparently if you slide the alpha down to approximately 97% it will work properly.

Oh, and apparently this problem varies according to machine stats, etc.

It seems to work fine when I embed it in HTML as well. Thanks.
Next time I will search the forum first though =)