I've seen other bug reports that portions of pages were missing. I found this in two different places today.
I logged off, logged back on again, yet still had the same phenomenon.
I logged off, closed the tab, opened a new one, yet still had the same phenomenon.
I closed the browser to try again, yet still had the same phenomenon.
Finally, I cleared the browser cache, and that resolved the problem. See the "before" and "after" pics attached.
IE 7.0.5730.13 on Windows XP SP3
Cheers - Bob
