Export to Quicktime/Movie to MPEG-4 Quality Much Worse with Snow Leopard?

I just tried exporting an HD movie from iMovie using Export to Quicktime - Movie to MPEG-4 for the first time since upgrading to Snow Leopard and besides taking forever to export, the quality at the same settings I've used before is terrible. There's terrible macroblocking even on relatively slow moving scenes. I've exported several movies using the same workflow previously to upgrading and the video was perfect.
I use mpeg-4, H.264 encoding, 4096 bit rate, 1920x1080 HD resolution, key frame every 15 frames. It's definitely a change in the encoder as just sharing to the Media Browser results in expected quality.
As a test, I tried upping the bitrate to 5120 but it didn't help with the macroblocking.
Anyone with similar problems and/or a solution?

I've actually started noticing more artifacts using the Share to Media Browser quicktime presets. The movies that are created don't seem to be as high quality as ones I've created before. It's almost like quicktime is missing keyframes or something and then artifacting. It's not consistent. I've got one mobile formatted movie where it artifacts badly in the first minute and then not at all afterwards. It's kind of frustrating.

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