Portrait image problem.
First time I've experienced this but just in case anyone has a similar issue.
I had a problem today where some portrait images were being rotated 90 degrees and displayed as landscape.
It's nothing to do with Perch. It appears to be some flag set in the actual image file.
Easiest fix is to copy the image and paste it into a completely new file.
Like I say, probably very rare but it was driving me potty. Thought I'd share to save anyone else the pain!