here is a quick followup
there is one thing these reports have in common, they are new reports that i designed few weeks ago.
And on all these reports, that loose formatting when navigating thru pages, i hide comlumns and shrink the report (remove white space) based on the parameter that user selects. I guess IE does not like it.
The technique i use is described here http://blogs.msdn.com/b/robertbruck...lumns.aspx
so i am afraid i would have to redesign these reports using diff approach