I had this exact problem with the Multi-Tab not working. Here's a link to the solution: http://nonasims.wordpress.com/tag/multitab-6000/
If you use a .bat file to open your sims game so that the DCBackup stays clean, you'll need to modify it so that the ccmerged.package doesn't get deleted. Here's how I set mine up and no more problems with premium content after (change the location names as needed for your system):
...
If I may suggest the following change, to make it work for other's computers with minimal editing:
@echo off
del "%HOMEPATH%\Documents\Electronic Arts\The Sims 3\CASPartCache.package"
del "%HOMEPATH%\Documents\Electronic Arts\The Sims 3\scriptCache.package"
del "%HOMEPATH%\Documents\Electronic Arts\The Sims 3\compositorCache.package"
del "%HOMEPATH%\Documents\Electronic Arts\The Sims 3\simCompositorCache.package"
attrib +r +s "%HOMEPATH%\Documents\Electronic Arts\The Sims 3\DCBackup\ccmerged.package"
del /Q "%HOMEPATH%\Documents\Electronic Arts\The Sims 3\DCBackup\*.*"
attrib -r -s "%HOMEPATH%\Documents\Electronic Arts\The Sims 3\DCBackup\ccmerged.package"
start /d "C:\Program Files (x86)\Origin Games\The Sims 3 Supernatural\Game\Bin\" Sims3Launcher.exe
The last path is taken from your shortcut to the game on your desktop. Just remove the extra 'Sims3Launcher.exe' from inside the quotes when you paste it.
%HOMEPATH% will automatically point to your user directory. I know that there was an easy one for the current user's Documents folder, but I can't remember what it was....