I have a fully paid regular account on SMC and have had bizarre intermittent problems with viewing .jpgs, editing my grammar problems, and writing/viewing PMs. The most annoying part was the intermittent character of it. Today I switched from Firefox to the DuckDuckgo browser and suddenly everything works consistently. Probably somewhere in Firefox there is some privacy blocker that disabling add-ons and changing settings didn't fix.

Anyway, hopefully sometime in the future someone searching on unable to edit, trouble viewing pictures, .jpg, can't see PM will find this post and ease their misery.