Hi Mirek,
I tracked down the problem. For ccp4-7.1 on macOS, the coot path should be /Applications/ccp4-7.1/bin/coot, not the one in /Applications/ccp4-7.1/coot.app/Contents/MacOS/coot. The current workaround is to manually specify the path in the GUI preferences -> Graphics -> Coot path. If you have ccp4-7.1 installed in another location, just replace /Applications with that location. I have verified that this should work on macOS 10.15.6 with ccp4-7.1 by restoring an old phenix.refine job and displaying the model and maps in Coot 0.9 EL (ccp4). I'll be updating Phenix to use /Applications/ccp4-7.1/bin/coot if it is available.
Let us know if you have any other questions. Thanks!
Research Scientist, Molecular Biophysics and Integrated Bioimaging
Lawrence Berkeley National Laboratory
1 Cyclotron Road, M/S 33R0345
Berkeley, CA 94720
Tel: (510) 486-5709
Fax: (510) 486-5909