I finally figured it out. During a recent automatic update the System Mechanic suite enabled Privacy Guardian with Digital Fingerprinting Protection. This service was pointed to as a conflict in another thread regarding different browsers I don't use, but once I realized it had recently been enabled for all my browsers I tried turning it off and that did the trick.
Since it doesn't slow my system down or appear to cause any other conflicts, I re-enabled it for Firefox and Chrome, which I use all the time, but left it disabled for Edge, which I will continue to use only for Windy.com.