Finally!
Who would've thought? When I did my upgrade to vB 3.6.8, etc., I uploaded all my files using my Mac. On a whim from the past, I recently re-uploaded all non-image files for my entire site using Windows. Not only are the header errors gone from my arcade pages, but I'm keeping my fingers crossed that several other problems have been fixed.
I'd had this problem many years ago with a different forum, but it's not been a problem until this upgrade.
Not sure why it's popped up again now.
My thanks to MortysTW and MrZeropage for your attempts at helping me to troubleshoot this. Really... thank you both very much.
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