There are files, and there are files... the important thing is what is inside the file?
MOV (or AVI or MP4 or ???) is a wrapper that may contain many things... not all of those things edit well
Report back with the details of your file, use the program below... A screen shot works well to SHOW people what you are doing
For Mac http://mediainspector.massanti.com/
You should also compare EXACTLY what is inside a file that works -vs- a file that doesn't work
We will need more info as stated in John T Smith's post, but if you open your .mov , in something like Quicktime, and use ''movie inspector'', what codec info do you see?
A .mov is, too make it simple, combined of a video codec + audio codec + extra info(metadata). the .mov(also called wrapper) combines them all together. This is why we ask more info, so we get an idea of whats inside the wrapper.
The only thing I see is that one is 29.97 which would indicate NTSC and the other is 25 which would indicate PAL
Your problem MAY be that you are trying to mix video types in one sequence
I changed a bunch of settings and tried Media Encoder but nothing worked. Finally I transfered all my files to another computer and was able to render and export perfectly fine. I guess the problem is with my Premiere or Mac but I don't know what....