I resolved my problem by deleting my entire site, replacing my database with a several week-old backup (our site isn't real busy so losing a few posts isn't really a big deal), and reinstalling 4.2.2 and then updating to patch level 4.
The problem persisted and turned out to be based on a poorly structured ModSecurity rule implemented as a security issue by our host. So, bottom line, I was chasing my tail. GlowHost wasn't the source of the problem at all.
Hope this helps someone else; my problem is solved (until another undisclosed edit to Modsecurity raises its ugly head at my expense, LOL).
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