I also pick up this issue from time to time. I remember quite some time ago it was a regular issue which was then resolved - and is now occurring again.
Octo-LNB to 2 x 5.2 switches. Explora1 (Prim) & HDPVR 2P (Sec), Samsung 55" UA55F8500 Smart 3D LED TV, HDMI picture & audio via Onkyo TX-NR626
receiver. Explora2 in bedroom, HDMI picture & audio to Samsung 32" UA32F5500 Smart LED TV. 100Mbps M-Web fibre (OpenServe).
One possible solution (other than fixing it permanently) - allow us to use a list here as well instead of these thumbnails, which use up processor power... something this processor isn't too good at offering...
I know this is a bling industry, but please be practical as well MC.
@Cya_DStv1 - please ensure this is passed on.
This happens too often... in the CU "You're Watching" section we get missing thumbnail pics, which then becomes a guessing game or extra effort to decipher.
Not good enough MC...
(How and when it happens appears to be completely random.)