Recently a friend on customize.org discovered a reason for crashes with WSH panel while closing foobar. The reason was his WSH panel and a Track Display were overlapping eachother. I tested it on my config and i have no more crashes with WSH panel. I might even say that it is really stable now.
Be also careful not to draw outside of the panel in your jscript, it also created crashes here.
Thought it was important enough to share it in a all new topic