Newsbin gets into a state where it will not enqueue any downloads nor will it exit for a period of a few minutes.
I use a filter, [0-9]+\.jpg\s[0-9]+, to select spam posts. I then Control-A to select then Shift-Del to delete these posts. Newsbin then will neither download anything nor exit for a few minutes. I see the process taking ~12% CPU time but no disk or network activity. Its spinning in a thread @ NewsbinPro64.exe+0x510a84.