Datagrids Jump when Scrolled

[Ray]

I posted this last year and never got an answer.  Anybody want to take a 
shot at it?  I'm now using 7.1.1 but the same problem persists.

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In a data grid with the vScrollBar set to true, scrolling suddenly stops
working.  Any attempt to scroll through about 100 rows of data simply
jumps to the end and shows only the last row at the very top of the
grid.  It doesn't matter whether I use the arrows, drag the scroll tab
or click in the scroll bar.

Many thanks,

Ray Horsley
LinkIt! Software