hi j
sadly, the developers cannot fix an issue that only happens on your computer... except if you get a developer to physically access your computer.
we have had a few issues being reported for the dark theme on the newest macos.
we will need to sort them out, but we don't have many developers using a mac and -- i guess -- even fewer using the dark theme on macos.
and, fyi, 1.6 will be the continuation of 1.5.5, with bug fixes, not a new version.
when the development branch 1.5.x will be ready, it will be called 1.6 and we will have a big party.
for the time being, you might consider using a light theme on your mac...