(Apologies for the odd email formatting. Am relying to digest)
The problem was that rake would not run without sudo (password_auth) & I
finally tracked down the cause to an errant line in my bashrc which I
subsequently commented out & then all was fine.
Sorry for the noise,
But masters, remember that I am an ass.
Though it be not written down,
yet forget not that I am an ass.
Wm. Shakespeare - Much Ado About Nothing