I am using the 2013 version of Solidworks to complete a floor layout as a Solidworks drawing for the manufacturing plant I work at. It was working fine until, suddenly, I was unable to add relations between lines, or change/add and dimensions using the Smart Dimension tool. I tried copying the drawing onto another sheet, which seemed to work until I edited the sheet format and then came back to edit the sheet or deleted the original sheet. Also, this problem does not exist on the second sheet (the basement) in the same file or with any lines I draw while I am editing the sheet format, so I think it is a problem with the sheet. Attached is the file I am working with.