iOS4 Multitasking doesn't work on 3GS: Drawer is empty

[melmel]

I jailbroke my 3GS 2 days ago with Sn0wbreeze to iOS 4.0. Not knowing the new features of the iOS 4, I finally realized multitasking is not working yesterday, and probably never worked to begin with. I searched for solutions online and it seemed like Winterboard might have been an issue when iOS 4 was first released, but an update of Winterboard was released back in June to fix the problem. Since I didn't jailbreak until 2 days ago, and verifying the version installed, I already have the newest Winterboard, but am still having the same issue. I tried disabling the themes I was using to no avail. When I double-click the home button from the home screen, it slides up with an empty drawer with no icons, just completely blank. When I double-click the home button within an app that supports multitasking, nothing happens. What else could it be that's causing this problem? It would be awesome to finally be able to multitask without using backgrounder.

Here is a list of jailbroken apps on my phone:
Activator
biteSMS
BossPaper
Categories
Five Icon Dock
FontSwap
GV Mobile
Insomnia
MxTube
OpenSSH
Rotation Inhibitor
SBSettings
WebViewController
WinterBoard
Rock App

THEMES:
Suave
Twilight Theme

ADD ONS:
Autolock SBSettings
Insomnia Toggle
Push Mail SBSettings Toggle
Vibrate Toggle SBSettings

Please help, thanks a million!

Nevermind, found the solution. It was BossPaper.