Image added in TinyMCE editor is removed

I am implementing XWiki as an internal knowlegde base for the IT department I work for. The installation was straightforward and went relatively smooth. We are using XWiki 1.0 Beta 3 / MySQL 5.0.27 / Tomcat 5.5.17 on a Windows machine and after exploding the war file I have imported all of xwiki-1.0-beta-3.xar. However, when I edit a (new) page with the WYSIWYG editor and try to insert an image, the (uploaded) image is displayed correctly in TinyMCE but doesn't show when I save the page. The html source code only shows an <br/> tag where the image was. When I add an image in the Wiki editor, the tag '{image:example.jpg}' is inserted and after changing the file name (in WYSIWYG or Wiki editor) and saving the page, the image is properly displayed. But when I try to edit and save the page, the image is again removed. This behavior is a real show stopper for us. I searched the user email list and JIRA but can't find anything about it. Does anyone recognize this and knows a solution or workaround? Thanks in advance! Ronald Borman The Netherlands