Allow button doesn't work in Security & Privacy
I just installed Sophos Anti-Virus on the latest version of Mac OS High Sierra. Sophos requires that it's service is allowed to run in Preferences/Security & Privacy. I go to Preferences/Security & Privacy, I click on the lock to unlock it, and I click on the Allow button. No matter how many times I click the button, nothing happens. It is literally stuck.
The Sophos service will not run without this, and I can't do anything about it. I tried uninstalling Sophos, but this thing is still in the Security & Privacy, it won't go away.
Any suggestions how to fix this are greatly appreciated. Thanks!
Mac Pro, macOS High Sierra (10.13.1)