Re: Mercury square Midheaven - problems communicating (especially in public)?
Mercury MH aspects denote a public orientation to communicating.
Squares can be shyness with a weakend mars, in aspect to uranus ~ verbal abrasion, trines and goodies - smoothe talkers, but must listen closely.
mh is ruled by saturn ~ the whole world is watching ~
aspects to natal mwrc are key in the 10th house appearance.