screen redraw problem

[J S]

Hi,

I have an application which has some boxes in the window. The window itself 
is scrollable. When I scroll down -  no problem, but when I scroll up the 
boxes turn into long vertical bars. This problem doesn't happen with Exceed, 
but on XFree86 (both Linux XFree86 and Cygwin-XFree) it does.

Can anyone advise me whether this is a bug, or is there some setting I need 
to add? Let me know if you need anymore information.

Thanks for any help.

JS.

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