This is aimed at Premiere Pro, but may help
A link with many ideas about computer setup http://forums.adobe.com/thread/436215?tstart=0
Read Harm on drive setup http://forums.adobe.com/thread/662972?tstart=0
Work through all of the steps (ideas) listed at http://ppro.wikia.com/wiki/Troubleshooting
If your problem isn't fixed after you follow all of the steps, report back with ALL OF THE DETAILS asked for in the FINALLY section, the questions at the end of the troubleshooting link
What is the Project Preset chosen for the source footage from this new camera? It should be AVCHD HD and you will want to also match the Audio settings with the Audio setting on the camera. Many AVCHD cameras can be set to record in Dolby Digital 5.1 SS, and if you have one that does, you will also want that to be selected. Your Project Preset should match your source footage 100%, or you will experience issues.
My guess is that you are still using the old Project Preset, and the new camera will require a different one. When this is done, you should not have a red line above the Clips in the Timeline, and playback should be very smooth and in sync.
PS - AVCHD material takes a lot of CPU power to process. One needs at least a Quad-core CPU, and a fast i7 is even better. What is your CPU speed and core-count?
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Have you got at least a quad core processor and 4 gigs of RAM, per our recommendations?
If so, have you set up your Premiere Elements project for AVCHD, and have you ensured you've selected the RIGHT AVCHD specs for your particular video?
Are you rendering your project whenever red lines show above your clips on your timeline?
I hope it goes without asking if you've gone to Windows Update and manually downloaded the non-critical updates for your machine and if you've ensured you have the 8.01 patch for Premiere Elements.
Many thanks. This seems to have cleared up the problem. I still seem to have
some video artifacts when I play back the video that I do not see when I show
the video straight from the camera to a large HD screen. Also, seemingly
different from what you said below, I have a horizontal red line above the
timeline and also a red line vertically to show where you are on the timeline.
Not sure what it might mean that I do stil have a red timeline.
I have a lot to learn but this seems to be getting me going.
It's the horizontal red line that runs above your clips along the top of your timeline that you need to worry about, Bob. And, if you've got a lot of clips with red lines above them, they could well account for your playback problems.
Have tried rendering these files yet by pressing Enter, as I recommended earlier? Once rendered, the red lines will turn green and your playback should go much more smoothly.
Thank you very much! Looks beautiful.
Great news and glad that things are going well now.