transcode gives me an Illegal Instruction when I attempt to transcode into svcd (or vcd), with or without PSU selected...any ideas?

I'm using the presets for SVCD, and everything else seems fine. The vobs copied, decrypted, and can be played from the hard drive. The image grab worked fine, and so forth. dvd::rip just sists there, but when i try the command myself by hand, i get that error. If anyone has experience thus, i'd be happy to post the specific command and error message.