This is a 1.6.2 fix for the logs table. This fix is not included in the 1.6.2 download, but it will be included in the next release.
Use init_db.sql for the MySQL database installation, and then also apply the following:
Code:
ALTER TABLE logs ADD l_time FLOAT DEFAULT '0' NOT NULL;
which can be found in the update_db_to_1_6_1.sql file.