[Jonathan Cheever]

Well not to start beef but that seems the way Mac is going. My experience with customer support is terribe. I am using FCP7 so I just get pointed to forums.
As far as the issue goes. I talked to some camera mfgs and reps. From what I understand is new firmware and mac aren’t getting along with my drift and the T3i I was using. I guess that should be corrected soon enough. In the mean time I have to stick shooting in 720 60 with certain cams.
Also I have come across many message boards with people having the same problem. The only culprits being pointed out were video cards and machines not having the muscle to view HD.
I may make the switch to AVID as my personal belief is Mac is trying to appease the masses opposed to the pros. I guess I am neither at the moment, but an autononous company isn’t for me.

[Jonathan Cheever]

Letting you know you are not alone.
I have problems with 720 30fps and 1080 30fps. Strangely enough, shootin gin 720 at 60 fps works with everything.

Here is what I crossed off as problems.

Ram is not an issue. Tried it on my computer and also a friends (latest macbook pro, 8 gigs ram dual core SSD + video card)

Getting jerky playback on RealPlayer, compressor Quicktime and FCP.

VLC is like butter. Transcoding videos via VLC may be an option, however it just makes editing that much longer.

I hope narrowing it down helps, but I am finding a lot of people with this problem and no solutions. Mac is seeming to become less professional.