I just purchased Premiere Elements 2018. I have about 50 short clips from my GoPro loaded into the work area. All have the same capture properties. Only about 4 of the clips have the orange bar above them which rendered when i select Render Work Area. The problem I'm having is that the rest of the videos are choppy on playback and they appear to need rendering. I cannot view them properly to edit them. Is there any way to force the program to render them?