Okay Now i know what's going on. It seems your resolution has something to do with it, as I just tested on my system with an 'irregular' widescreen res. and i was able to reproduce. Good catch!
Although I am having right-click menu issues on a variety of resources, none are as consistent or as bad (notes & clipping option just not there, even if the menu isn't falling off the screen) as in Piper's When i Don't Desire God. Maybe it's just coincidence, but it is a consistent one.