Originally Posted by
ajt09 
I just wonder if there's something to do with where the image was saved from, that's affecting it. Some rather odd shenanigans happening for me.
It's a strange one indeed. Files I've uploaded many many times to the site (in stories) suddenly stopped uploading but I've figured out that I can get around the problem by opening the image in paint, and overwriting it with itself and then uploading again. Seems to fix the issue - thanks to Brendn for this comment on another part of the forum which appears to work!!