I am unable to upload a screen capture to my Box Enterprise account using Single Sign On (SSO). I set up an external password but had the same problem. I tried with a regular free account and was successful. I get redirected to the Box homepage after granting access to the Greenshot Tool. Symptoms are similar to ticket #1627. I am using Greenshot version 1.1.9 build 13 (64 bit) on a Windows 8.1 (64 bit) machine.