Is therer a way to recompile the document when there were no changes? Currently hitting
C-c C-c a second time only runs the document viewer (Skim.app in my case).
C-c C-c should just give you a suggestion for the command.
Often the suggestion is correct and one hits
RET to accept it, but there are times when an extra compilation is need (e.g. when using theorem marks from
ntheorem). It such situations you can type
L, for example, and TAB-complete to get
LaTeX as the command.