SSDT2012 (11.1.20905.0) apparently is not identified as a supported version of Visual Studio.
From the log:
Found installed product - Microsoft Visual Studio 2012 Shell (Integrated)
Id #1595 | Release:
| Updated: Mar 29 at 4:33 PM by nmed | Created: Jan 25 at 12:13 PM by ErikBo
Currently it is not clear when was the last time when add-in loaded XML Metadata from the server. It should be added to properties of the document.
Id #1168 | Release:
| Updated: Feb 14 at 6:18 PM by nmed | Created: Mar 7, 2012 at 1:45 AM by nmed