Dear ALL; Recently we updated our CCP4 to 6.1.13 with CCP4Interface2.0.6. However, there is an error when we ran autobuster. The error messenge from Buster: a check of the input MTZ file (test.mtz) gave an error - even after we tried to fix it. For details see above and ./mtzchk.2.log. If you don't want to do these checks (and want to use the MTZ file as it is): please use the command-line option UseMtzchk="no". You'd be doing this at your own risk and don't recommend this! The information in mtzchk.2.log: >>>>>> CCP4 library signal ccp4_general:Cannot open environ.def (Error) raised in ccp4fyp <<<<<< mtzdump: Cannot open environ.def mtzdump: Cannot open environ.def How can we fix the problem? Thanks a lot, Jerry McCully