I started to import 10 or so CSV files of 100 items each, one by one. After each import, I could see the resulting collection in the sidebar. Capacities seemed to take longer to process each file, even though they were each of the same length. I got up to the 8th file, whereupon Capacities seemed to hang/crash (white screen). When I refreshed Capacities, only the very first 100 items had been stored, despite the earlier visual feedback that at least the first 7 batches had been imported successfully.