After installing the latest nightly build (06/24/06) and rescan or new scan a big music collection (scanned more than 6.000 files with more than 12.000 play lists [some with more then 500 entries]) the scanner.exe consumes more and more memory.
Therefore, on a 512MB system the scanner crashed after ~80% scanning of files (in the last part of the play lists). You will get an error message your system is running out of virtual memory (page file is set to 0, so only the physical memory is available).