Thanks for the swift response, jggimi
Ah, yes, I did see this posted on undeadly, asking for testers. Seems like a somewhat likely candidate. I'll likely try this tonight. I suppose the way I see it: contribute back as a tester, it could render my issue fixed, or, worst case scenario, break stuff, in which case I can reinstall and have my system up and running again in no time.
Unfortunately, I don't recall the previous date of my -current system before upgrading.
Whilst I'll certainly take the above on board, will be testing later and reporting back, I'm still open to any further suggestions, of course.