I have only been able to experience this while droning. All the rosters on the ground start flashing and any weapon I use doesn't show it's effect (ie. I don't see RayGun/Missiles flying).
Also the damage figures don't show up. Which makes me scared I'm not doing any damage.
Good (the damage numbers seen in this pic are my own):
Bad (the damage numbers seen in this pic are not my own. My own don't show up, also the RaGun damage u see is not mine):
Also note the roster is missing:
Note: I am using my custom designed RPOS, but this has no impact on the result.