Can you share the actual commandline please?
Sure thing!
cd to the image dir, then
`/Users/eze/.local/src/Smalltalk/OpenSmalltalk/SqueakRC.app/Contents/MacOS/Squeak Cuis6.0-6090.image one two three four`
`/Users/eze/.local/src/Smalltalk/OpenSmalltalk/SqueakStable.app/Contents/MacOS/Squeak Cuis6.0-6090.image one two three four`
and similarly for Cuis:
`/Users/eze/.local/src/Smalltalk/OpenSmalltalk/SqueakRC.app/Contents/MacOS/Squeak Cuis6.0-6090.image one two three four`
``/Users/eze/.local/src/Smalltalk/OpenSmalltalk/SqueakStable.app/Contents/MacOS/Squeak Cuis6.0-6090.image one two three four`