Why didn't you post this in the beta forum (moved it there now), the 1.5.1.19 is just a release candidate, not a non-beta version?
And you could've really provided more informationDoes 1.4 for example detect exactly the same problems that cause 1.5 to shut down?
Because with just your post, it could be about everything, including malware that is at fault, and the way it is, it surely would not lead to "more work" to be done on the rc.