Tal, change the DIV element from “page” to “content_box” or “content” at the Font Size options page.
Upgrade to version 1.6. In previous versions, there were some issues in IE dealing with DOM elements.
Change the font size units to “em” at the plugin options page and try again.
Download the new version 1.2 that resolves this issue. If you still have problems, don’t hesitate to contact me.