Header should remain visible while scrolling stopped working (VS 2005 table)

Hi, 

I have many SSRS reports which used to have their table header fixed while scrolling (by cheking this options on the table properties dialog). 

Lately I've seen this stopped working, although I see the table has <fixed header> true property in the code, the header does not remain visible while scrolling. This does not work by me anymore in Explorer 9 nor in Chrome.

(PS- I might have added something to some file long time ago in order for the reports to be seen on chrome too- can't find details and don't know if related at all).

I'm using using SSRS 2008 R2 with VS 2005.

How can this be fixed?

Thanks

Namnami