If you are in HTML mode and expand the editor to "fit to window", then go back to Normal mode, the editor window shrinks back down to the normal size instead of staying maximized. This results in being unable to scroll up and down the page until you press F12 or are able to click on the "fit to window" button to disable it.

This issue seems to be happening in Firefox only.

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I am able to reproduce the problem in your example page, and we are using version 6.0 of the CuteEditor from mid-July. I can also reproduce the problem in these forums.

I am using Firefox version 2.0.0.6 to test with. Here is a step by step to reproduce:
1) resize the browser window so a scrollbar appears on the page.
2) change the cutesoft editor to "HTML" view
3) press F12 or click the "Fit to Window" button
4) change the view to "Normal" view

At this point, the editor will revert back to it's original size, but firefox still seems to think it is expanded. you cannot scroll up or down the page.