I have an issue and I am not sure how to fix it. I am on the first floor RCP, placing a can light fixture on the face of the ceiling grid. This is a linked in arch file, and I am using Revit MEP 2011. When I select "Place on Face", I can see the can as my pointer on the ceiling grid, but when I move it to the left all of a sudden it disappears. Please see attached zip file with a little video.