tedster - 4:13 pm on Mar 19, 2011 (gmt 0) [edited by: tedster at 1:40 pm (utc) on Mar 21, 2011]
It does sound like a document mode compatibility problem. That's something I haven't run into yet for the sites I work with, but I have read about it. Maybe this reference from Microsoft will provide a clue.
Defining Document Compatibility [msdn.microsoft.com]
[edited by: tedster at 1:40 pm (utc) on Mar 21, 2011]