Disappearing mates in SW 2007

I'm working on an assembly of 20-30 fairly simple parts. The assembly
includes a part with a master sketch that is extremely large. I model
the parts without external references for the most part. I mate them
into the assembly, save the assembly, close Solidworks, re-open the
assembly, resolve everything, rebuild everything and everything's fine.
I do this more than once. I go home. This morning when I opened the
assembly, dozens of mates were broken, always because a surface on a
part was not recognized. Any ideas what may be causing this in SW 2007
sp 2.1?
Thanks,
--
J Kimmel

www.metalinnovations.com

"Cuius testiculos habes, habeas cardia et cerebellum." - When you have
their full attention in your grip, their hearts and minds will follow.

 

Were you getting the "Face ? **Invalid**@part name" in the Mate
selection box? If so, chances are you removed or changed a face that
was being used in the Mate and SolidWorks can't find that face name
again. If not, I have no idea.

Steve O

 

I have expirenced this as well. I thought that it might be an issue
with files being copied for backup at night or something. Sometimes
supressing and then unsupressing the mates cleans it up. -Matt.