This seems to have been a problem for a long time, and I know there's a forum entry for it in the "pre 1.10 bugs" area, but that doesn't seem to be active. I saw something about it maybe being fixed or improved in 1.10, but I don't see any improvement. I regularly have the histogram in "Levels" adjustment layers freeze or disappear. Sometimes they recover after a few minutes, sometimes I have to restart Affinity Photo to resolve it. This also happens quite often to the main histogram view as well. I rely heavily on histogram displays for astrophotography processing, and if they're not working, then I just can't do the editing I need to do in Affinity. I am on Windows 10 (up to date), core i7 CPU with 32 GB RAM. Graphics card is a GeForce GTX1650 (nvidia driver up to date). I have tried this with hardware acceleration on and off, and also with the renderer set to WARP instead of the GTX1650. None of those settings have made an discernible difference, other than slowing some other things down. Is this issue still being looked at? IS there any word on timing for a fix? In the meantime, is there any way in Affinity that I can force the histograms to refresh?