Thanks for the fast reply. I guess I should have clarified that when I emptied my inventory, that included emptying my hot bar. Still got steadily hotter. Also, carrying snow and ice in my hot bar doesn't seem to help when the bug is in effect.
Oh, since you're here, another bug showed up today with blacksmith anvils. I can no longer pound wooden logs to get wooden gears. In fact, I can't make anything with them that I used to. Snow clumps, stone pipes, compressed iron, nothing. Re-logging hasn't fixed the issue, nor has breaking and replacing the anvil. What should I do? Do I need to reinstall something(s)? If so, how would I go about it?