Yesterday I decided to give Chrono Cross a shot, to see if my past problems with the game (glitches, screens never loading, game freezing, etc.) were the fault of the disc, or of my (quite ancient) PlayStation. I tried playing it on my PS3. All was going well until I used "Pilfer" during a battle. Kid entered her stance (the one the character enters right before using an element), and remained in that stance, as the sound effect kept playing...and nothing happened. I came back a few minutes later, and it was still like that. I wasn't too far in the game (I had just recruited Guile, and was making my way up the cliff to Viper Manor), but I hadn't saved recently, so I was a bit pissed.
So, looks like I'll have to just buy a new copy of the game.
EDIT: And just for reference, my copy of CC is fairly old (bought it on its release date), and, having been borrowed by many friends, the discs aren't exactly in top shape.