I admit it right away -- it's frustrating to have the software tell you things like it's told you today. Maybe this has occurred: The image/photo had a generic file name -- something along the lines of "img1003-432" or whatever. If that's the case there's a chance that someone else put up a photo with that same file name/number -- just by coincidence. Most digital cameras used some type of auto labels -- maybe yours and "his" do match.
And for sure when you try a second time, after renaming the file/photo -- the machine sees the very same text and rejects it -- even though it didn't post it the first time. What I end up doing in this case is to - - - BEFORE I click to post!!!--- click to copy, then try to post. If it won't - then you go back, throw out the one that didn't work, and open a brand-new black - and paste the text in there. Viola, it's done.
I've got to go right now so Alaine can use this 'puter, but I'll try to post a bit more on the subject - later.