locatedb truncated

SuSE 9 Pro Every night my locatedb (/var/lib/locatedb) is truncated to 63 bytes. When I run updatedb, it is created. How do I find what job is scheduled that truncates it? I tried "crontab -u root -l" and "crontab -u dw -l" and "atq" without mention of anything scheduled ever. What is the correct way of finding the problem?