The problem is with Imgur, the image hosting site. I can't upload images to it any more from my PC. I can access everything else on the site, and have no trouble signing in, or copy-pasting URLs from my albums on the site into the forum....but uploading doesn't work.
Now, I know it is a setting on my computer, because I have successfully accessed my account from my wife's computer, and uploaded a photo without issue. I wrote to Imgur a week or more ago, and received the following response:
Thanks so much for writing in to report this, I'm sorry to hear about the issues you're experiencing with uploading content. As a note, we have a currently Known Issue preventing uploads on desktop if their filename contains special characters. If that is not your issue, please follow standard troubleshooting below.
Is it possible that this issue could be related to your browser? Just to be sure, please make sure that your browser is fully updated, you have JavaScript turned on and you may want to disable add-ons/extensions in case one is conflicting. To narrow down whether it’s your browser or something on our side, you could also try it from another computer or browser to see if you have the same problem. Clearing cache and cookies for Imgur pages can also be helpful.
I know that it isn't the "special characters" thing, because changing the name of my images to names without any characters other than lower case letters didn't change the result. Also, I disabled Adblock Plus on their site (although I've used it there for years), and that made no difference. I have tried with both Firefox and Opera.....precisely the same result.
I'm not 100% clear about checking Javascript, but I followed some online advice and I'm pretty sure everything was set to enable Javascript to run.
What I haven't done is clear the cache and cookies. I really don't want to do this generally for my entire computer.....so if someone can help me remove just the specific cookies and cache elements that apply to Imgur I would be very grateful. Other than this any thoughts would be much appreciated. This problem has prevented me posting a large WIP of my greenhouse build, so any assistance will be much appreciated.