Here is another test of a completely simple HTML file using #startOpened, and its working:
I did see that referencing it from the same web server using a relative URL does not work - it definitely should, I'll look into this. (I've just recently joined this project and am still trying to get my bearings...and there is no one to get the bearings from since it hasn't been maintained for a few years, so bear with me!)
A few notes / questions / things to try:
1) What browser/version are you using?
2) Can you check the javascript error console for errors?
3) If you can make your page available publicly or at least try to resonably reproduce it somewhere I could see, that would help with the troubleshooting.
Regards,
Gal