Ok, another stab in the dark.
You may have your answer in your response.
Could it be whatever you changed in the main is nuking the page causing Osclass to switch to the backup bender theme in the gui folder?
I know that is really reaching but Xammp has some amazing abilities to overcome script issues whereas hosting providers offer little to no wiggle room. One missing anything can shut a page down when live.
I use wamp and I have seen where if I miss a simple "," , someplace my localhost sometimes will forgive me but online I get hit.
In any case as you see I don't have the answer. Just filling space until teseo or someone that does know responds.
Maybe with this bantering an idea will strike you.
Tom