Hmm somehow, the programme stopped working properly at some point, most likely due to some change in Imgur's stuff. I can connect to Imgur with their API key and post a screenshot, but a little while later (an hour?), the programme gives an error when I try to upload a screenshot, and I have to connect to Imgur again for it to work. Etc. I have temporarily switched to Myimgur, which is not 100% reliable, but it usually works.