hi adam,
just in case it may help your product development...
you can reproduce this issue by
1) setting the autoresise-option to on
2) using firefox (version 2.10 to 3.03)
3) and setting EditorWysiwygModeCss Property to a css-file that includes the following body tag
body
{
font-family: verdana, arial, helvetica, geneva, sans-serif;
font-style: normal;
line-height: 1.333em;
font-weight: normal;
font-variant: normal;
font-size: 80%;
height:100%;}
this reproduces this "neverending autoscrolling" in firefox
(if you remove the height 100% than everything works fine.)
regards from germany