Thanks Jesse, That would work if it was one model but I have 25 designers using 400 models across two countries so would not be workable. I have checked the pcf out files but I copied over the ones from SS4 to SS3 and still get the error. The thing is that it was working and I have not changed anything bar the upgrade from XP to Win7 and the AutoCAD from 2010 to 2011 Regards Ken
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