I have a problem with the BatchConverter utility (v2014.15.02).
I want to turn a series of shots into pdf, but when I start processing, batchconverter closes SW2014 and opens SW2013. And so necessarily he can no longer open the plans which are all in 2014 version.
I would like to point out that, in the general options, the "Restart systematically" box is unchecked.
I don't know if it already existed in your version, but myCADpassport allows you to choose the version of SolidWorks to use, see attached video.
If this option did not exist yet, then:
I think you installed SW 2013 after SW 2014, by default, the myCAD tools used the latest version installed, so try to repair your 2014 installation to put this back on track.