Intermittent - some content not showing on page load in IE

I have an FCKeditor instance loading in an IFRAME, but sometimes in IE the content doesn't display completely.

I've recorded a screencast at http://screencast.com/t/X2jqBFOJk which shows the editor opening three times - the first two times the content is partially hidden, the third time it loads correctly.

Is there a fix for this?

(In the past I've used the Innova WYSIWYG editor, which has an initialRefresh method to combat this exact problem, so it seems it's a known IE issue).

Mike