Well, I played around more with this hack, and I think I removed most of the bugs created by my hacking.
I'm still ending up with a mix of gradient areas and "regular" table headings, so I guess I have to put into place a lot more of the code for the gradient.
One area that is showing up as a gradient--that I don't really want to be a gradient--is the Date/Time field in the "Last Reply By" field.
The other issue is the one I addressed in my previous post--making the gradient "optional."
I followed Corona's code, and it still forced me to put in a graphic. I removed the code. Didn't make a difference. Still wanted a graphic.
I rehacked; I again tested with & without Corona's suggestion, and in both situations, it wanted the graphic to be there.
I don't know if other code is missing or what the deal is, but I will probably "unhack" the Gradient for now because I need to work on my style templates, and I can't do that if I'm "forced" to choose a gradient for every single one.
One other weird thing. In the "standard template" -- no matter what -- it kicks the color I have in the category header OUT and replaces it each time with a bright red.
After I get my regular board set up with the upgrade, I'll play around with the gradient hack on my test board.