I've found a problem with the initialisation of the options dialogue. I can't say for sure that it is causing your problem but it definitely needs fixing anyway. I''ve uploaded a revision (build 188.8.131.52)so if you download again, you should get the new version -assuming you can flush all your caches.
The problem arose because of a last minute change I made. (My software is like the jelly that never sets!)
Anyway, please let me know whether or not the problem is now fixed.