I have two parts. One is a flange, and one is a building model. Whenever I try to mate a plane of the flange to a building face the program places the part some arbitrary distance away. The same thing happens if instead of creating a coincident mate I create a parallel mate and a distance mate between the two planes and set the distance to zero. Does anybody have any suggestions, neither part appears to have any external references....I have attached a picture showing what the program seems to think is a coincident mate...despite the fact that the two 'coincident' planes are a ways apart. Any suggestions, this is incredibly frustrating I am new to the program and am unable to find a solution.