I’ve been messing around a lot with device metadata today, but I’ve certainly noticed blank white screens rather a lot. Sometimes they do eventually populate. The other times I give up as it takes so long.
Not relevant to the original question, but the STHM server error is becoming more frequent, and the latest curiosity is that when I go to add devices I no longer get the near immediate display of brands/types to choose from. Instead the system displays ‘searching’ for rather too long. Maybe it has always done that, but if so it was very quick and I didn’t notice.