I tried it (also 0.9.1 version) and it runs on my 1.4 GHz Power PC G4 AGP tower / Mac OS 10.4.11. 640 RAM (yea I know I need more RAM, LOL). Same thing with video set @ High quality - stuttering. Lower the quality to Medium / Low, pause & let buffer get full then hit play - watchable & quality still looks good. The app pushes my processor between 20 - 70 %. Think it's more of a streaming issue maybe and I'm a fast DSL connection.

We have to remember that this is still a beta version.

*** Side note: My son is doing a download on his computer during this testing which affects my streaming ability. I'll try later when he's done.