I am running 13.1 on a MacBook under Big Sur 11.7. On two occasions, the software crashes on launch with error code 814. This error persisted for several days, and it seemed to be resolved by an update for Safari, but this may have been a coincidence.
Wolfram Tech support suggests that there is no fix for 13.1, which implies that the product is potentially unusable for an extended period of time.
