I had a real BAD TIME because of this, but as us Laurie Cheers is a human being, so errors can be commited......
I started deleting entities by type and restoring them as they caused no trouble..... but when I came over some monstermakers .... i found that when you fill the space that says " Angles of monster ", without Smartedit appears a key called "noise2", and I had put "0 270 0" so hl read the first number as a sound file name("sound/0"). As the name of the key indicates, it is a wrong default keyvalue for the entity............
so beware when using spirit, bugs can be found..... and may squeeze your brain trying to find the solution.....