I've noticed a glitch in Flash Player 8+ and thought that I would share it in case some of you were unaware.

When you use cacheAsBitmap, transparency within the movieclip it is applied to will render with a slight "ghost" similar to a white fill with an _alpha value of 1. The end result is that the movieclip's bounding box will become noticable at render time.

So far, I have experimented with ways to eliminate this artifact and the only thing I've found that resolves the issue is to set cacheAsBitmap, then apply a mask to the cached bitmap that preserves the transparency of the original movieclip.

renderhjs, I noticed alot of this "ghosting" in your node based pathfinding engine's demo in particular. Vengence MX, your troops demo suffers from it also.

I'm on an older machine which may have hardware that presents this bug as opposed to newer machines. Be that as it may, if you're a purist and want a clean render, look into applying a secondary mask after caching your bitmaps.