>In a Grid I want to highlight a single cell in red to show errant data. Yet when I change the Forecolor in the "Text" object for the grid THISFORM.REFRESH causes the whole column to change color. If I do THIS.REFRESH only the cell changes color until the next THISFORM.REFRESH then again the whole column changes.
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>Is there a way to change single cell colors in my grid?

You should use DynamicFore/BackColor properties for particular column. There is an example in Knowledge Base how to use them.