Indeed, it works, great work!

Thanks, Chris! Works perfect now!
okey. I can change theme in my forum now. Thank you chris. Now I am telling that bug to turkish users

This bug has been fixed in the latest code.
Please note the latest code is not live on the site or for download. An update will be released which contains this fix.
Dang, should have checked archived fixes first! Thanks, Chris!

Even Tiki's quick theme plugin is working again!!!
Thanks CB for the patched global. Uploaded it and can have other theme except the default. The first theme we did was a cool orange one, the second one is called dark ride. Both show up, but the mybb default seems hung on the orange one. Even when reverting it seems stuck at this point.