Fixed (I hope). It was a bug in SparseGrid2D that hadn't gotten recently changed along with Continuous2D and other portrayals. Also fixed a bug where simple portrayals weren't passing mouse event on to their children -- that's why MovablePortrayal2D was only working when it was on the top of the simple portrayal chain. Sean On Aug 13, 2011, at 9:35 AM, Martin Erdelen wrote: > Thanks for the prompt reply, much appreciated. > > Finding a (possible) bug in the first week of using a major > application is a > new personal record for me :-)