It looks like there's something up with GtS v0.18.x on arm64 specifically, as a few people have reported issues with not being able to start GtS on arm64 devices like the RockPro64. We'll look into a fix :) In the meantime arm64 folks: better stay on v0.17.4 for now. But if you do have GtS v0.18.1 working fine on arm64, please let us know so we have the datapoints. Thanks!
Edit: it looks like this applies specifically to the RockPro64, weirdly enough. Other arm64 devices have been fine (thanks for the data points everyone).