Hey Keni, the N key has always worked for me in PRV to toggle on/off snap. (X3 and Platinum)
I had a look, and with
no project loaded, my N key (in Preferences, Keyboard shortcuts) says "Not Assigned"
When I
load a project the N key assignment becomes "Snap Toggle Extended"
Is this the same for you ?
If you do a search for "Snap Toggle Extended" key assignment, there isn't one
Makes me wonder if the N key shortcut is a setting saved within projects ?