What computer operating system is your Premiere Elements 11 running on?
First question, do you have the latest version of QuickTime installed on your computer with Premiere Elements 11?
To support that you do, please go to Publish+Share/Computer/QuickTime and verify that you see presets for the
From what I have read about your camera, the camera could be recording
1920 x 1080 60i (29.97 interlaced frames per second/60 fields per second)
1920 x 1080 p30
1280 x 720 p60
1280 x 720 p30
Which one are you using?
What is your project preset? Please verify using Edit Menu/Project Settings/General.
The video compression is listed as H.264 and the file extension .mov. H.264.mov "should" be supported
by Premiere Elements.
How are you importing the H.264.mov into Premiere Elements 11 - Add Media/Files and Folder/Project Assets or something else?
What camera did you previous videos come from? And, can these previous videos still be imported without issue into
the same Premiere Elements 11 project that has its problems with your new source of video files?
Let us start here and then decide what next.