>>The map area (FRAMERMAP) looks OK (~ 1/3 of height ?) and I can see that you are assigning the remaining height to the MESSAGE element (with a 24px adjustment) - just doesn't appear to be working. If nothing has changed at your end then it's some IE quirk here. I'll dig a bit more if I find time....
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>Yes, 1/3 of the height but that is adjustable in Settings\Settings\Upper frame height in percentage.
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>Those two are adjusted simultaneously. What is strange is that it seems to work on the first one only. I would recommend reinstalling IE over or testing IE from another PC to see if you have the same situation.

Just tried on a different machine with IE 8 (other machine is IE10) and that works OK (Message area originally small but resized automatically during load)

Since it appears to be machine specific don't worry about this - as before, I'll take a closer look when I have time.....