Well, bad news. I had begun using circular references when the update hit and I bumped into the REINST bug (reclassed a ton of my widgets to some non-existing class and crashed the editor every time I attempted to remove or just click on one) which has made me lose a day’s work (and thank God for backups) and is caused, or so I have read, by circular references.
I’ll have to think of another way to go about this it seems :/.
Edit: Found this thread questions/129259/bug451-reinst-in-umg-reference-lost.html about using events for this kind of thing. Leaving it here in case it helps someone other than me.