Wavetable editor - Wave Source - right-click context menu

In the wavetable editor with a wave source, is there a way of getting at the context menu (via right-click with the mouse) without effecting the wave being drawn? Thanks.

For me: If want to flip the waveform via the menu option, right-clicking causes an (unwanted) edit in the waveform.

This is on a Mac with Vital 1.0.5.

Edit: see below an example to illustrate (right-clicking to bring up the menu)
Edit: I think this might only occur when Grid X = 0

this is not happening in windows, works fine here.