Attaching Screenshot function no longer works

Attaching a screenshot results in an error using IE 11, works in Chrome. This was previously working.

Steps:
1. Create a bug
2. Reopen bug and select "More>Attach Screenshot"
3. Take a screenshot and copy it into the Attach Screenshot window using Crtl+v
4. Click Upload

Actual: Error displayed "The error occurred during image upload - you will need to try the pasting image again. Sorry for the inconvenience."
Expected: Screenshot should be attached to the bug

This has been working previously

Workaround: You can save the screenshot as a file and attach the file to the bug. This actually attaches it as a screenshot and labels it using the name of the file.