No AXON HD Pro thumbnails in Media Picker

Hi all.

I tried to refresh media of my AXON HD Pro in HOG 4, but no thumbnails showed up in Media Picker. Opening the status gave me this:


Therefore, I don`t know if it is problem of AXON or HOG.

Axon runs firmware 1.0.3.525
HOG4: firmware 3.5.1
CITP is on in HOG and AXON, all communications are done by ARTNet, and I can control the unit correctly, just there are no thumbnails, and my user media is not displaying in Media Picker as well.
Does somebody have any idea, why it might happen?