Hi Dennis,

I think this is related to a bug in IE 8 in Windows 7 RC , as Phil mentions there is a patch available for MoI V1 to fix this.
You can find a related post here http://moi3d.com/forum/index.php?webtag=MOI&msg=2572.1

Patch download here http://moi3d.com/download.htm Version 1.0 to 1.1 update

If symptoms persist see you local MG ;)

Cheers