I've recently been evaluating using TincyMCE on my drupal site. I love the way that it works, but I'm having this problem with the base URL's for inserted images. Basically from Firefox, when I go to edit a node with an inserted image in the body, it changes the root relative link from files/sitename/images/sample.jpg to ../../../files/netservices/sample.jpg (relative to tinyMCE?). If you then post the page, the image link is forever broken. In IE it appears to not modify the image reference, but rather renders a broken link in TinyMCE(unless the image file link is tinymce relative. I'm using an adjusted files location "files/sitename" rather than straight "files". I don't know if this is relavent to the problem. TinyMCE reference a base url setting that can be passed to init to help with these kinds of troubles, but I can't find any place in the module that sets this. Should it? Any ideas about what needs to be done to resolve this problem?