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An excellent point, Stanley. As with most questions, it can't hurt for users to supply such relevant information as frame size, frame rate and data rate when having issues with AVCHD.
Thanks for the clarification.
Personally, I own and operate arguably the most popular AVCHD camera to this date and that is the Panasonic AG-HMC150. That particular camera records only in High-Profile H.264 Level 4.1 AVCHD and does so at four different bit rates.
I have had no issues in CS4 importing, logging, editing, or exporting the native AVCHD files at 6Mbps, 13Mbps, and 17Mbps with my recently upgraded PC (3.0Ghz Quad Core CPU, 4GB RAM, nVidia GeForce FX1700, Vista Ultimate 64 Bit).
That being said, footage shot at the 21Mbps bit rate does respond more sluggishly in Premiere as opposed to the lower bit rates. The program remains stable during the edit, but it definitely demands more from the system.
Keeping that in mind going forward, may help you make a better decision about whether or not you opt to edit AVCHD footage natively, or transcode it into a different video format. Currently there are several options for transcoding or editing AVCHD video. There is the Blackmagic Intensity card. You can use the free MainConcept AVCHD Transcoder for video files that were created using a Panasonic AVCCAM camera. Another option is from CineForm called Neo Scene. Procoder 3 supports AVCHD transcoding to other video formats. Lastly there are some plugins like MainConcept MPEG Pro HD 3 which allows AVCHD editing on legacy products like Premiere Pro 3. Lots to consider, but definitely possible with today's systems and applications.