In response to post #43209145. #43209380, #43211385, #43217790, #43224430 are all replies on the same post. These are a few I fixed them myself: In DownloadMonitorControl_KeyUp lvwTasks.FocusedItem can be null so it needs a check in the if The CategoryId infered from downloaded mods is often wrong. It would be better to add them all to "uncategorized" category. The SizeColumnsToFit() in CategoryListView is really annoying when you want to resize the columns. There is no need to prevent the horizontal scrollbar. I added (for myself) F2 (rename), Ctrl-X, Ctrl+C, Ctrl+V, etc to the grid editors in the CategoryListView because they don't work.