What should i do when HEVC media can be imported, but becomes blurry and gets stripes?

After getting the same results, I tried the (free) Handbrake program.  The two clips that wouldn't work natively with Premiere Elements went through Handbrake.  For the 100fps HEVC clip, I set Handbrake to H.264 and 100 fps.  Premiere Elements accepted it at 100 fps.  

So, it (apparantly) is not the 100 fps all by itself that doesn't work.  It is the combination of HEVC and 100fps that trips up PrE.  

I also tried the three clips in Premiere Pro on the same computer and they were useable as is without Handbrake conversion.   

I'm getting the same results.  GoPro seems to be always leading with "cutting edge" formats and codecs.   I'm going to try Handbrake and Premiere Pro.  More to come....

Okay so i formatted my SD card that i use in the GoPro and shot for all of you 3 test Clips

https://www.dropbox.com/sh/u2g2r39aza86xyy/AACesMz5mQZ-rdULMjQbcX_Sa?dl=0

1) 50fps H.264

2) 100fps HEVC

3) 50fps HEVC

Clip 1 works just finde in Adobe Premiere Elements.

Clip 2 and 3 don’t work in Adobe Premiere Elements

So my computer obviously has a problem with the HEVC codec. Please tell me if the clips work on your computer 🙂

Ann is right.  If it works on my computer it is likely the driver.  If it doesn't work on mine and looks like yours, then Premiere Elements isn't up to the task.  Don't shorten an existing clip.  Either take a short new clip with the same camera settings or put up a "big" one.  

Can you put a shorter clip on DropBox or similar?  I would like to try it on my computer to see if there is something to learn that would be useful.

The intended way to establish project settings is to add some media and put a primary clip on the timeline.  Premiere Elements then picks the best match.   How are you doing it?

When you first add your HEVC clip to your timeline, is there a yellow-orange "render" line over it? Ideally there should not be -- at least until you add effects. A render line indicates that the program is not able to match its project settings to your video's specs, and that can result is the playback issues you're seeing.