@katie.hawkey When the app hangs on this loading screen like this it is typically because of a network connectivity issue.
Are there any outbound firewall rules active on the Mac or router? The app needs to connect to www.syrinscape.com on port 7977.
From a terminal window, can you attempt to connect to port 7977 with telnet?
$ telnet www.syrinscape.com 7977
Connected to syrinscape.com.
Escape character is '^]'.
CTRL-] then type
quit to break out of the connection.)
You could also try the old (offline) creator https://syrinscape-us.s3.amazonaws.com/files/Syrinscape-SoundSet-Creator-macOS-0.8.2-20170322.dmg … it also has a player app that connects to the same server and on the same port, but was built on a different (newer) machine.
If the old (offline) player app can connect, but the new (online) player app cannot, then it might be a problem with the build machine we used this time.