Hi, the two gmm options --two-step and --iterate and conceptually incompatible, and this fact has very recently been enforced in gretl; OK. Now when I still use the two of them together, for example in the code given in the ticket https://sourceforge.net/p/gretl/feature-requests/208/, then I get two different error messages in a kind of cycle. The messages are roughly: - Incompatible options -- which is correct! - Orthogonality conditions must precede the weight matrix -- which is rubbish in this case. This is reproducible in a way the every other time the respective other message will appear. I'm guessing that when the first error is encountered, gretl is still "hung" in the gmm block and thinks it's continuing from there, with the ensuing confusion. thanks sven