Steps to Reproduce

run fiddle:
http://zkfiddle.org/sample/10nu5ui/1-Maximized-CKEditor-disappear-in-borderlayout
maximize editor using the maximize toolbar button (last row, 3rd button from the right)
resize browser window

Current Result

page appear blank du to editor width resizing to a few px

Expected Result

Editor should cover the whole page

Debug Info

Only happen when child of a borderlayout region using autoscroll=true

Root Cause

Workaround

replace autoscroll true on borderlayout region by:
<center>
<div height="100%" style="overflow:auto">
//your content here
</div>
</center>