If you have Screen Time enabled, and haven't yet added PC Matic to the Always Allowed list, you might want to do so now. In fact, it should be mandatory upon installation. I just discovered that if the feature kicks in when a sub-feature like Downtime or App Limits triggers it, it will prevent the app from running until you return to your Mac, leaving your Mac vulnerable to malware and attacks.
To resolve this issue, you must perform the following steps:
Open "System Preferences" from either the Apple contextual menu, the Dock, Launchpad, or the Applications folder in Finder.