Running CS6 on Mac 2.66 intel xeon with 16 gb memory, gobs of hard drive space and runing OS 10.7.5.
When inporting AVCHD 1080 60p from new Canon XA-25, video is choppy, and continues to be after placing on timeline and rendering.
The timeline was created by dragging clip onto new item. 1080 24 and 30 works fine and 1080i 60 works fine.
Did you try setting your Playback Resolution to something lower like 1/2 or 1/4? Also, if you get Properties on the file, does the "Type:" (second item, just below File Path) report as "MPEG Movie"?
Yes reset resolution and the type is MPEG. the camera allows one to chose AVCHD or MPEG... If you want 720P or SD video you must use mpeg. I have sent copies of the clips to Adobe Support and they say they are analyzing.