I'm breaking up my master catalog into individual years so they're smaller and run faster. I created a new catalog (say 2019) then choose "import from another catalog", which I choose my master. It takes a while, then compiles a list of files to import (they are originally all checked boxes). I uncheck all the boxes, then select only files from 2019...this works really well...until I get to a file that has a large number of images (say around 8000 or higher). It refuses to allow a checked box on these large files (even though they were originally checked). Seems to be a bug, I've tried everything to work around this. Any suggestions?