said by ez2cy:
But...as I said, it's happened this evening a few times and no files after in minidump.
AH, I missed that it had crashed after you'd switched to the minidump setting.
The only reasons I can think that might happen involve disk problems: failure to read the crash handler code, or failure to write the dump to disk.
Ah, do you have a page file on C: ? Certainly with full dumps, the dump is written to the page file, and then copied out to the final file after reboot (all this because you don't want a messed-up system doing complicated stunts like creating files). Minidumps are likely handled the same way though I am uncertain of that.