git.el problems

Ive been trying to use git.el in emacs

I mentioned earlier problems that seem to be between emacs and git;
viz that with a detached head I get
Branch:     fatal: ref HEAD is not a symbolic ref

Poking around a little further I find that the git.el code is probably
problematic independent of git

eg. When I give add-a-file (a) in the git-status buffer, I get

Wrong type argument: arrayp, nil

I gather this is happening in the ewoc library -- most likely ewoc-locate

So...
Surely somebody must using git with emacs (under windows)? What are they using?