Thanks Petr, I can follow that one now and repeat it, should be easy to fix now.

Another note - a shortcut for reset cplane is to either right-click or left-click a second time on the View / CPlane button.

And you've probably seen this already, but when you use "Apply to all views", then the cplane will become global and also the Top/Front/Right views will shift to be plan views of the cplane. That's also when your typed in coordinates will use cplane coordinates as well. The Top/Front/Right view labels will show like Top (cplane) while this is active, and also the x,y,z point coordinate readout on the bottom toolbar will show a "c" in front the point coordinates to indicate they are cplane coordinates and not world coordinates that you looking at there.

If you uncheck "Apply to all views", then the cplane will only be applied to the 3D viewport and the Top/Front/Right views will remain viewing in the world axis directions and typed in coordinates will not be changed.

- Michael