Both I and a technical rep were convinced that the issue was solved when we saw the check mark on webroot in "Full Disk Access" on Catalina. That was the issue I’d phoned about. We did a remote connection, per recommendations from the support web site. All looked good -- until it didn’t.
While Webroot, without rebooting my Mac,, was scanning, the box in Apple’s “full disk access” did not stick after all.
Learning that Time Machine could not yet be handled by the current version of Webroot in Catalina, I also disconnected Time Machine: but the scanning continues in an infinite loop even though Time Machine is physically disconnected..
So those two issues -- failing to "stick" in Full Disk Access and an unending scanning loop -- make this software not ready for prime time. Please understand that I do not fault the person who did the best job possible during a remote connection. But WebRoot is continuing to lose my confidence as a multi-year subscriber. We need a fixed release soon, not what has turned out to be a false claim of a Catalina fix.