Joao, I am using the latest version of phenix 1.8.1-1168 1.8.1-1168 should not have that "problem". If you suspect there is still a problem, you can send me the data and model files off list, explain what exactly the problem is, and I will have a look right away. FYI: there is Phenix mailing list for Phenix-specific questions, where I can also explain in great details the behavior with the B-factors you observe. All the best, Pavel