To the guy with the problem. Go to your WoW folder, look for a subfolder named cache. Inside that one make another folder called WDB. Now go into WDB and make another folder called enUS.

The path should be WoW/cache/WDB/enUS

This should fix the problem. It might take a few relogs to built up enough cache information so that the problem goes away. The whole 'bug' stems from the fact that WoW somehow fails to create said folders, resulting in it needing to query the server for all your items, settings ect everytime you log on and causing a de-syncing with the server.