I'm currently unable to use the image uploader. When I press the "Upload image icon", I'm able to select or drag & drop an image from my computer. The image then successfully previews in the uploading interface. However, when clicking the Add Picture button, I get the error message:
Request returned an error [error]
I've had this problem for the last day. Before that, I occasionally had another image uploading error which was remedied by disabling "antivirus/security" extensions in Chrome. I did so for this new issue also, but then discovered that I had the same problem in Safari where I have no extensions at all.
My cookie settings in both browsers are set to Allow from current website only.