Same thing happened to me yesterday, and strange that uploading to imgbb was also not working.
I am taking a small break on uploading images in forum.
You might wanna try
Postimages. I've been using it for years for uploading images here (and in other forums) until Talkimg appeared. I tried it again today and it worked fine so I guess that's the one I gonna keep using until joker_josue sorts out the issues.