WowAce

What version of Grid2 are you using?

r838

What game client version (windows or mac) and language are you using ?

Win 10, English

What steps will reproduce the problem?

1. Use Grid2

2. Have new raid members join group

3. Two problems that occur when new members join the group:

• Raid: New raid members joining group are either not displayed at all (their unitframe doesn't show up), or if their unitframe does show up, it's always set to 'unknown' as the name. 
• Party: New party members joining group are always set to 'unknown' as the name

The only way I've found to fix this is to keep reloading my UI every time someone new joins.  

  
Did you try having Grid2 as the only enabled addon and everything else disabled?

Yes  

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

This was not an issue before 8.1 hit.

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).

There was no error, just the display issue. 

Please provide any additional information below.

It's a blizzard bug in patch 8.1, already reported:

https://www.wowace.com/projects/grid2/issues/628

A workaround was already implemented. Update Grid2 to latest version 855-beta.