Problem refreshing the frozen columns in a split grid

I would really be very grateful if someone could help me with an issue I have and I am unable to solve.
I have a split grid with 5 frozen columns (the first five columns starting from left to right). When i hit the page down key in the keyboard several times, the data within the first five locked columns occasionally disappears when paging down the screen. I am using IE6 and IE7.
Does anybody know how to solve this problem? Does it have anything to do with the instruction enableSmartRendering. I render the data view using a XML file.
I would really be very grateful to anybody that could help me with this.

Please open ticket at … lit_mode&s[]=splitat