Pem fastners changing size without warning.

After I updated to SolidWorks 2013 I've have a big issue with pem fasteners changing length's and size without warning.

This is a big problem since it also changes the BOM in the drawing. If it's not caught we could have incorrect parts made.

Has anyone else had this problem ?? If so have you found a fix ?

Thanks , Nick

SolidworksToolbox