Ensemble is unusable on systems that fallback to the J2D pipeline.

According to "hg bisect" the first changeset that caused the problem is:

The first bad revision is:
changeset: 13264:f22c7b56a06c
parent: 13259:0961ea4065eb
user: Martin Sladecek <martin.sladecek@oracle.co
date: Fri Jul 22 12:31:15 2011 +0200
summary: Backed out changeset 0961ea4065eb

Note that setting dirtyopts=true causes mouse events to be ignored (this looks like a separate bug, which has been present at least since b37). I'll file a new issue shortly.