UDL Breaks for Some Players

Hi there, I'm not entirely sure I know how to phrase this, but I have an issue where sometimes UDL breaks for one or more of my players.  That is, they can see the whole map as if UDL was not enabled at all.  Sometimes it's just one player, sometimes it all (both, really, as two of them are playing on a single laptop).  I've tried resetting the darkness, toggling UDL off and on again, to no avail. Sometimes when we come back for the next session, UDL is working correctly for the players, and other times not.  The two on the shared laptop have also experienced some pretty bad lag, but I think we resolved that tonight with hardware acceleration settings. Does the hivemind have any ideas about this?

Switch to Legacy Dynamic Lighting.  You can very easily cause this deliberately by simply installing 1 of a thousand adblocker extensions.  This version of lighting allows for simple cheating by players and is a gigantic disaster of a project for the devs to have wasted years now trying to develop.  I trully do not understand the logic behind the choice to continue UDL as it will never work for random internet tables on their product.  It forces the DM to pry into the browsing security and habits of random internet players all in an effort to troubleshoot a poorly designed feature, that is doing something that didn't need to be improved upon as LDL already functions just fine.