[OpenLayers-Users] Pan/zoom bug with IE7

[Kenneth, GEOGRAF A/S]

I have been tracking an annoying bug in IE7 (FF2 and IE6 works).
When I pan (and sometimes when I zoom), the map stops displaying and 
interacting (the position freezes).
After some digging, it turns out that the map size suddenly reports 
itself incorrectly.
Sometimes it is 100x100 (because the style says w+h = 100%).
Other times, the width is correct, but clientHeight is 0.

Is this a known problem, or is there a known cause?
I'm using OpenLayers 2.5.

-- 
Regards, Kenneth, GEOGRAF A/S