Are you using Internet Explorer? Mark Wu, the guy who was working on those plugins said there is something wrong with IE, and he was working on a solution, but I gather the problem is pretty hard. I have not tried out IE on my own to try to track down what is going on.
It sounds like you might have enough experience in javascript to help out?
You can checkout some of the messages on the development mailing list, and maybe ask Mark a question there - he doesn't check the forums, as far as I know.
http://devel.lifetype.net/mailman/listinfo/plog-svn