Bolts become very large when open old assembly model

SF 2009-01-30

Hi All:

I am using Solidworks2009 SP2, Toolbox is OK for new assemblymodel, but when I open old assembly models, the bolts and nuts onthe assembly will become very large, not oringinal sizes.
I don't know how to fix it.

Thanks in advance.

Richard
Solidworks Toolbox