Thank you, Stuart, for the instructions. I have been suffering from the same issue as well since April 6: all subsequent snapshots failed to boot on virtualbox. I also was able to reproduce the problem in qemu. Interestingly, like Richard, I, too, am using a Thinkpad X1 Carbon; however, openbsd is running in a vm. In any case, I reported the issue to bugs@
best, cdude
