These ones are checked: - Reduce memory usage when the cache is not needed - Enable caching of disk writes - write out untouched blocks every 2 min - write out finished pieces immediately - enable caching of disk reads - turn off caching if the upload speed is too low - remove old blocks from the cache Advanced Options: - diskio.cache_reduce_minutes 9 - diskio.cache_stripe 128 (I never changed these settings. They are still the original, first installed, settings.) --- So I wonder why I have problems now, cause previous version always worked fine Using Win 7 64bit, Memory 8GB, Hard Drive 500GB. And by the way: Maybe I was mistaken about the Dump file. ".dmp" <-- is this the dump file? I found 4 in Bittorrent Appdata (Crash happened 3 or 4 times I think)