I just lost all of my pop-ups for one of my HUDs.

[starless]

For no apparent reason. I haven't reinstalled HEM. I haven't done anything different.

All of my pop-ups for my HU HUD now have just the first 1 column and 2 rows (some of them had many, many more). The file names of all of those pop-ups start with HU_* . My other pop-ups are fine (they are all on the same computer, in the same folder).

What the hell is going on?

[udbrky]

It could be data being corrupted.

Please see this FAQ to fix Windows problems - Hold'Em Manager 2 FAQs - Poker Software :: How to repair Windows files

Are the files in the config folder in

For Windows Vista/7/8: C:\Users\username\AppData\Roaming\HoldemManager\
XP: C:\Documents and Settings\User_name\Application Data\HoldemManager


See this tutorial for showing system and hidden files:
Hold'Em Manager 2 FAQs - Poker Software :: How are Hidden Files Viewed in Windows?