Hi @jgoose if Scaler 3 is only not opening standalone this is likely on account of the standalone state file. This should be resolved by deleting the following file: /Users/[NAME]/Library/Application Support/Scaler 3.settings
Note that we believe to have discovered the cause of your initial error which likely also led to your standalone issue and will be releasing a Scaler v3.1.1 update very soon addressing this and several other issues to improve overall stability and operation.
You can bookmark the following forum page using the forum’s bookmark feature to be notified when this update is released: Scaler 3 Latest Version - #6 by davide