Well. it's fixed starting from revision 574 :) The culprit was rev354 where I added window resize code. Sorry for commit message, I was extremely busy at the time, using this software in my band. I coded this mostly at night and at that time I just commit what was in trunk :( The issue was cause because this plugin tried to resize editor window before it was fully opened.
Thanks for this investigation. For now I can confirm this issue. I'm not actively maintain this code anymore, but I'll try to do something with this ASAP.