Operating system: Windows 10 Pro 64-bit
Graphics card: GTX 970 4gb
Many times (like 8 out of 10), when I try to open the library of blenderkit nothing will show. It appear the "blenderkit searching" message but nothing happens after that. Sometimes restarting Blender fixes it but I would say that is due to meer coincidence.
Exact steps for others to reproduce the error
Select object, select category in the blenderkit addon.
Based on the default startup.