Morning all

I've got an odd problem with parts stretching when using the grips to pull out knew sections of ductwork, and I don't know what has changed within the database to let this happen. 

In the attached image, you can see the problem demonstrated on a circular VCD, but it happens on other pieces of equipment live fire dampers as well.

I used to be able to stretch the grips on the dampers and it would draw a new piece of ductwork, but now it just deforms the part.

Any help with this would be most appreciated as it's driving me mad.

Thanks very much

CADmep Fabrication 2018