I am using VS 2012 and the latest version of the SDK (5.0.15) on Windows 8 with CRM Online. Installed the VS 2012 SDK tools and created a project based on an existing solution in CRM Online. CRM Explorer connects correctly when I use the Discovery Server disco.crm.dynamics.com. I did a Save All in VS, exit VS and then launch VS and open the project from inside of VS. While trying to open up the project, I get an alert box with the message "CRM Explorer No Organization has been specified". The project opens but CRM Explorer does not work. If I exit VS and delete the .suo file from the project folder CRM Explorer works again until I do a save, exit and re-open. I have to do this each time I close/re-open VS.
Any suggestions on how to fix this?