Cursor disappears from xinha field the browser is maximized.

I cannot see the cursor in xinha field when I maximize the browser. When I restore the browser and click on the xinha field using mouse pointer than I can see the cursor blinking. Sometimes I do not see the cursor at all. This issue is only with Firefox, in IE it is working fine.

Environment - 2.16.02 build 24231, vista and FF

This issue is similar to CMS7-4412 and this does not occur in xinha demo.