Component save as is not replacing existing component in open assemblies

I have noticed in the past week, that the save as option isn't work as I expect. In the past, if I did a straight save as of a part, it would replace the part in any open assembly. However, this isn't the case any more. Is there something that I have accidentally changed?

SoldWorks Premium 2016 SP 3

No PDM

SolidworksAssemblies