I have latest version of WP (3.3.1) with multiuser option enabled. I had used W3TC on some of the hosted blogs. Since this plugin gave me hard time I decided to uninstall it. I removed cache, disabled it and remove it using build WP uninstall feature. The web pages are displaying content, but no pictures, galeries, ... The browser displays: "The image <insert correct path&name> cannot be displayed, because it contains errors." Images and pages worked just fine before and if they are downloaded or moved to a different location they work well. The problem is on all the blogs, the ones that had W3TC enabled and the ones that had not.
(I did clean the cache of my browser and make sure the plugin files are gone).