SWX 2010 sp2.1 crash with split feature

Has anyone seen this error message before?

This happens with one file we are working on, I create the split feature, name the parts to save, and when I hit the green tick, I get this error message then crash of SWX, this is repeatable across machines on the same part. I have tested other parts and the feature works fine.

Have logged it with support, so will see, was just wondering if anyone could offer any advise.

Thanks

SolidworksGeneral