When I try to upload an image, I'm presented with the following dialog box,

The dialog box does not allow uploading either from my computer or by posting a link.

This happens only on Chrome browser (running on Windows). Clearing cache and cookies, and restarting computer does not resolve.

Is this just my computer? Or is this a site wide bug?

Additional info:

Clicking on 'click' to upload does nothing. Dragging image onto dialog redirects me to the file location on my computer. Clicking 'Add picture' redirects me to http://$.com/upload/image?https=true where $ is the respective Stack Exchange community.

UPDATE:
A Norton extension for Chrome was the source of the problem.