Since upgrading to 4.1 I've had to clear out my MT directory daily, as core.xxxx (numbers) files keep being created at about 15MB until my disk space is full.
I've read other threads that address what these core files are: http://forums.sixapart.com/index.php?showtopic=53104
However, I have not found a thread that deal with these being created at excessive amounts.
I would appreciate any tips to troubleshoot this issue. For now, I have disabled all plugins to see if it is related to them.