My full camera and section view stopped working. I was using them all morning and early afternoon. Stopped for meeting with the client to review the plans and dinner, afterwards I open the file to make changes, click on camera and get a blank screen. The camera does not display on the floor plan either. I'm using X-12, and have been for about a month with no issues. I thought maybe the file is the issue, opened other files and started a new plan and get the same results.