When I try to insert an image using the upload tool, I get:

[![Failed to upload image, please try again!](https://i.stack.imgur.com/k3w0i.png)](https://i.stack.imgur.com/k3w0i.png)  

(source: [mrozekma.com](http://so.mrozekma.com/imgur-broken.png))

I'm running the current version of Chrome on Windows, with a number of SE-related user-scripts. Confirmed by several other users, so not just me.