Comment #2 on issue 903 by benjamin...@gmail.com: ROEdge without ROLine locks the image http://code.google.com/p/moose-technology/issues/detail?id=903
That has fixed it.
However prior to your fix, your example ending in 'view bitmap' didn't raise an exception (or lock my image). Actually if I highlighted my example in Workspace but before executing it with Alt-d I moved my mouse to the far side of the screen, then Roassal opened without a problem. Only when I moved the focus into the Roassal window did the image lock. Perhaps the lack of your image locking is a difference in event processing between OSX/Windows. That would be nice to identify but out for scope for this issue.