OK, I figured out what's happening. Somehow, a setting got changed, and explorer.exe was set to "never show labels". Dunno how that happened, but I disabled that and it's working now. 

I am OP. I know 7+TT is causing this; if I close it the folder names come back. Also, this only started happening recently, so I'm going to see if I can find an older version that will not have this problem. Also I've tried tweaking the settings to see if any of them are causing this, but it seems like it's just a default behavior. Using 4.5.1