Are both picture files for each star at the CARTOGRAPHY\VY CANIS MAJORIS folder available? If not, copy the complete folder by hand.
Interestingly, if I use your provided database, a star system VY CANIS MAJORIS is listed at the treeview of the Cartography panel and it contains VY CANIS MAJORIS and VY CANIS MAJOR B.
Clicking onto the star system name or one of both entries within shows both stars in the detail view.
http://i.imgur.com/a/EtAav
Used some of my pictures and renamed them to fit.
This is very odd, classic case of 'works on my machine'

TCE can't update the star class when entering a new star system. It will only update, if you scan the primary star..
Yes I perform a Detailed Surface Scan, the class appears to update until I then sort the star classes.

ACK.