Cant see enemy on arena ¿Causes?

Hi, it happened to me like 3 times this week , It usually happen with the same person (3 different people)
https://i.imgur.com/a5qA9jD.jpg
https://i.imgur.com/k4kQGiY.jpg

Cant see the enemy, only while targeting I can see the red circle, no plate no image... its pretty anoying because I can't track him while atacking his arena partner.
Anyone know the reason? Maybe addons? Disable transmorg on account settings?

Sorry for my bad english.

it is a side effect of the "wotlk client with WoD models" provided by warmane.

To solve the issue you can delete the wod models:
1. Open WoW folder
2. Open the Data folder.
3. Delete the patch-w.mpq file.
4. Delete the patch-x.mpq file
5. Open the enUS folder.
6. Delete the patch-enUS-w.mpq file.
7. Delete the patch-enUS-x.mpq file