WowAce

 Cata Classic pre-patch has some bugs with Grid2 that didn't exist in WotLKC. I was using 2.4.1 and didn't realize how out of date it was since that's the version both WoWup and curseforge's updating app seem to use for WotLKC, but I also tried manually updating to 2.8.19 wrath version and the same thing occurs. 

Clicking on various statuses doesn't let you change any of the options. The tabs for the options are just blank pages. The entire page is blank when you first click on them, then when you click onto something else and then back, you can then see the General/Load/Indicators tabs, but the tabs are blank with no options or ability to change anything.

Buff groups don't show up in indicators at all, but individual buffs still seem to show up.

Things like health-current also don't show up in text indicators any longer and the options for those statuses also can't be seen.

The health bar still seems to work as normal with health-current, names work, my mana bar is still there and all my status/indicator combos that are just of individual buffs still show up in icon indicators. 

I tried turning off all other addons and just loading Grid2 and Grid2 options and the same thing happens.

 edit: just to add, health bars actually can bug out and just freeze where they are and stop updating until you reload your UI as well

Update to 2.8.20-cata version.

That seems to have fixed it, thanks.