I thought that the problem when using intensity/contrast in adjustments (it is extremly slow to the point I think the computer freezes) was solved by restoring preferences and restoring warning messages, but as it turns out the problem is still there! Turning of the graphic card processor helps maybe a little (one or two times) but then there are other issues such as I can't use the filter "lightning effects". The problem is there wether I work on a big or small file. The only thing I can upgrade on the computer is to the OS Catalina.
okay i'm glad i'm not the only one! i've lost so much work because of this bug. first it was just brightness/contrast. then hue/saturation did it too. nightmare. i work with a lot of digital collage so this has been a MAJOR f'ing problem for me. a couple of times a recovered PSD was available, but definitely not every time. really rough.