Mates

I'am having problems with mating componants. I've got aplumbing layout, and when i mate an elbow,(or any other part), itwill tell me it is fully defined after one mate. The part is notfixed, i have checked this numerous times. I then have to deletethe mate (or mates), and redo all of them, deleting one will notfix the problem. In most instances it will mate correctly thesecond time, but at times i will have to repeat this more thanthat. I have reloaded SW more than once, but the problem persists.I am running 2008 1.1. ( i also have 2007 on my machine, and do notexperiance this problem). I would like to go back to 2007, butbecause we have numerous users on the network, alot of the partsetc.. have been saved in 2008 ...

HELP??SolidworksAssemblies