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On macOS users may experience a non-functional mcgui, especially when having configured a local preferences file:
A respin of McStas v2.5 addressing this issue was uploaded to http://download.mcstas.org/current/mac/ on October 10th, 2019.
If you experience the issue with an earlier download of McStas 2.5, the situation can be manually corrected by editing your local preferences (.mcstas/2.5/mccode_config.json) file using an editor so that the field "MCCODE_LIB_DIR" looks like this:
As mentioned above, the newly uploaded v2.5 app has the issue fixed, so removing any old installation of McStas 2.5 and the local preferences file plus a reinstall should also fix the issue.