There
is a bug. The problem was that when '
-BminusA' is used, the program could end up changing the sign of the results
TWICE -- probably some leftover old code wasn't removed by some unnameable august personage.
I have fixed this problem in the source code, which is now on GitHub. I will start a rebuild of the binaries tonight, so using
@update.afni.binaries tomorrow morning (Friday, 14 Oct 2016) should make your life less confusing.