>First off, I'm not in here often, but usually I can find an answer to whatever problem I'm having with a quick search. Thanks to all of you who provide answers, they're used more than you know.
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>This time I'm stumped on something I think I've fixed before but forgotten how. I have a grid control, and when the form is running, the horizontal lines above and below the active row disappear. The net effect is that three rows are no longer separated. I have lots of other grids floating around where this is not happening, but I can't find any differences in Rowheight, Fontsize, etc. What can I do to get my horizontal lines back?

You may try to look at the rowheight, gridlines, and other related properties during runtime to check if it was changed somewhere unintentionally. You can use WAIT WINDOW or any commands to do this at the AfterRowColChange of the Grid.