Assembly hangs up while loading

All,

I am very new to Solid Works, and doing only my second major assembly and nearing the end.

When I open the assembly it gets to a cetain part and seems to hang up. I let the assembly load

while I was on a meeting for 2 hours, got back and it was still stuck on the same part. I have opened

the part on it's own and loads fine no problems, is there anyway to get around this? I am using SW 2012 SP3.0.

SolidworksAssemblies