I mean the Gameroom tab (I'm using the default one; not creating a new one using navigation manager). My banner background that show up in Forum/Album/etc... is not showing up in the Gameroom tab.

It's the same situation as the Arcade. This time it is the gameroom Tab instead. My test site was displaying fine. I even copy/paste the gameroom template from test site to official gameroom template code but it's the same. I don't know why. Do you have any idea?

You can shoot me temp details and I could look if you like. Cause I'm out of ideas

What's temp detail?

By the way, if I upload those gameroom files to my server and overwritten the file, will all my gameroom money and record be loss? And overwritten the template given also, would all my money accumulation from members also loss? thanks

temp details means if you want me to look at your site to see whats wrong send me (via pm details to log in)
as far as over writing files or re- importing the xml product
you will not loss anything .
Just don't un-install anything and your good ..
allway back up your site tho in-case something goes bad..

Thanks. I got this problem resolve after messing around with css. Apparently, I copy the whole code of custom style additional.css that I change a lot over arcade.css and it's fixed the style of gameroom.

not sure about that
unrelated to the aracde
but did you change it from stock?
if so revert it back