Used to use tversity and it was fantastic until I downloaded the latest version. Mine keeps crashing too. Tried everything to get tversity to work again, but just settled for WMP11 as well rather than installing more crap.
I read some ps3 forums and apparently it's quite a common problem but noone has found a definite fix. The only problem with going back to WMP is it can't play all the files like tversity could...