This has been reported before I believe, but there is something weird when saving images on the command line.
On macOS 10.12.5
$ curl
get.pharo.org/60+vm | bash
...
$ ./pharo Pharo.image printVersion
[version] 6.0 #60499
$ ./pharo Pharo.image save one
$ ./pharo one.image printVersion
[version] 6.0 #60499
$ ./pharo one.image eval '42 factorial'
1405006117752879898543142606244511569936384000000000
$ ./pharo-ui one.image
Does not open the UI, no window, hangs, no error, nothing. Since the image itself still works, it must be a UI thing.
Sven