This is nasty. It has something to do with eith copy and pasting properties from one condition to the next (if I create a new condition here that plays the out animation and instead of entering things in manually, I copy paste from the In Animation.
OR
I accidentally click the + next to the GW_Achievement_NewBase and realize that it doesn’t give me a condition, so I hit Ctrl-Z, and things get screwed up from that point.
Whichever it is, the GW_Achievement_NewBase widget becomes bugged, and when I try to reopen it, it crashes UEFN.