[IE7][WYSWYGdisplay]Don't edit text with css overflow:hidden

Hi all,

When I used ckeditor v3, I catched a issue in IE7 when include my css file in editor by contentsCss config.
The issue is "don't edit content in WYSWYG display in IE7 when using style overflow:hidden". For simple, I will give a sample:

- In source content display: I type
<div style="overflow:hidden;"> Hello CKEditor v3</div>
- I switch to WYSWYG display, now I cann't edit text! and when I click some points at left top of editor windows, the current content in editor is removed!

Please tell me about how to fix that issue.

Thanks.