Ok, now we are getting somewhere. It seems that a track has larger value for bpm that it was designed for the database.
First, restore the old unmodified database backup.
Open "1.6.5.8 RC7 - UPDATE FROM RC4 AND OLDER.sql" in notepad and search for
ALTER TABLE `songs` CHANGE `bpm` `bpm` DOUBLE(5, 1) NOT NULL;
and change it to
ALTER TABLE `songs` CHANGE `bpm` `bpm` DOUBLE(11, 1) NOT NULL;
and apply the update. That's the only update file you need to apply.
PS: Update RadioDJ directly to 1.7.2 and don't stick with older versions please.