c40pre9 - 19th Sep: calc_gtr1.F IF ( tracerAdvScheme.EQ.ENUM_CENTERED_2ND & .OR.tracerAdvScheme.EQ.ENUM_UPWIND_3RD & .OR.tracerAdvScheme.EQ.ENUM_CENTERED_4TH ) THEN CALL ADAMS_BASHFORTH2( I bi, bj, K, U gTr1, gTr1nm1, I myIter, myThid ) currently has gT instead of gTr1 and gTnm1 instread of gTr1nm1 thanks steph