Photoshop video render is generating red frames between some clips

I know photoshop is not the BEST tool for editing videos...but it is what I have and know.  It has done the job for me, and now that I am done my editing, the output rendered files have the ocasional red frame between clips.  I can't predict where they will show up, it seems each time I render, I get a different result.  

I did see these red frames inside photoshop at one point when I was testing playing back a section.  However, when I moved the time slider to the exact frame, photoshop would render the frame properly, and the red frame would tne be gone for that section.  I figured it was just a rendering thing as PS was trying to play back while inside PS.  But now, when I export->Render Video, I get the occasional single red frame, and they always appear between two clips I had in the original file.

Any ideas?  (I am new to video editing, in case you didn't already surmize that).  Any help or suggestions are appreciated!