IBM Notes 9 - Why-oh-why does my Contacts DB keep appearing when I start the client ?

This has bugged me, a bit, for the past week or so. Whenever I start the IBM Notes 9.0.1 client ( I'm running it on Mac OS X 10.10 ), I found that my Contacts ( address book aka names.nsf ) would always appear as an open tab: -

I tried ( almost ) everything to resolve this, including multiple restarts of the client, checking/unchecking this: -

I even jumped into Notes Basic ( via /Applications/IBM\ Notes.app/Contents/MacOS/Notes -basic ) but to no avail.

Eventually, I found this: -

and a Google search led me to this: -

Remove App from Startup

in relation to this: -

Once I removed the entry for Contacts: -

all was well.