Whenever I try to post an image, it'll get stuck uploading at 100%, so while the picture has been uploaded and everything, I can't post the topic. After that, I still have to reload to reply/post.
That's weird, also I've had that problem a few times before (if i remember correctly), but I don't remember how I fixed it. Maybe try closing the tab and re-opening it instead of reloading?
I think I had the same problem. I restarted the page and it worked.
Just try uploading it again.
It usually works after that.