Admin panel strange problem, I will go crazy over this!

[cagrie]

Hi there,

 

I'd appreciate if anyone can help me with this or I'll just go nuts!!

 

Okay here is the thing:

 

I have a backup version of my shop. When I extract it and logon to admin, the admin panel appears but without any css or JS, just like in this screenshot:

 

 

But when I replaced the "public_htm/cache" folder from the original 1.6.0.8 version, everything turns back to normal and I have the same good panel:

 

 

but after a while, if you make some certain changes (changed modules, clear cache etc.) it gives a nasty error similar to one below (depends on what you do) and the panel is broken again:

 

Fatal error: Call to undefined method AdminController::initPageHeaderToolbar() in /home/xxx/public_html/controllers/admin/AdminPerformanceController.php on line 611

 

can anyone guess what this is all about? btw, there is no issues with store front. its good all the way round.

 

any help will be greatly appreciated.

 

Thank you!