WowAce

What version of Grid2  are you using (Version is displayed in General/About Tab) ?

 3.4.2

What game client version, classic or retail, windows or mac and language are you using ?

 Retail, windows

What steps will reproduce the problem?

I've only tested this in raid, but different player names will become invisible/disappear pull-to-pull (the ones that disappear in one pull will remain missing). I can briefly make all names appear again by changing the name indicator frame level (to both high or low number, it doesn't matter), but they'll start disappearing again.
Did you try having Grid2 as the only enabled addon and everything else disabled?

  No

Was it working in a previous version? If yes, which was the last good one?

  Yes, I don't remember version number

Do you have an error log of what happened? If you don't see any errors, make sure that error reporting is enabled (`/console scriptErrors 1`) or install [BugSack](https://mods.curse.com/addons/wow/BugSack).

  No error log

Please provide any additional information below.

 https://imgur.com/a/chTDOUV

Goto the indicator settings and change the "Font Border" option, report back if a different font border  fixes the issue.

That seems to have fixed it!

Actually, I lied. It's not a problem in sporefall but is still a problem in alleria/crown, not sure why it's encounter specific.

Try with another font (you can try a standard font  like Friz Quadrata), some custom fonts are not working correctly in latest retail versions.