On the Matrix chat channel, we chatted about the issue you're raising here and we found several issues, which is why I'm including the package developer in Cc (Hi Jame!).

The first issue is that there are no access or error logs configured for the starman process because those are not in the standard Starman systemd service file: the ExecStart line in the service file needs "--access-log /var/log/starman/ledgersmb_access-1.6.log --error-log /var/log/starman/ledgersmb_error-1.6.log". When we added that to the installed service file, we were able to diagnose the actual issue.

So for the actual issue, it turns out that part of the required files are missing: the files stored in <repository root>/old/bin/ haven't been added to the package. This means that the software does seem to function, but many items in various menus, such as the "Add Transaction" menu you're using, won't work. We solved this problem by copying files onto your machine from the project's repository. Could you share the steps for others to benefit?

Thanks!