"Undefined" message bubbling up during video playback

[ginjaninja 605]

Watched a film last night on Emby Theatre WMC beta 3.0.20 on Emby Server 4.9.0.17.

30 mins? into the film and ~ every 30 mins there after an "Undefined" message would show  in bottom right corner within the player/app. Sometimes the message would be repeated 2-3 times hovering concurrently in corner for a couple of seconds.

never seen that before....closest experience was admin sending a message (which wasnt happening).

if it happens again i will send log.