Bug? - Can't turn off "Map Viewer Classic"

[DanAllen]

Hello,

I changed the Primary map viewer to Map Viewer instead of Map Viewer Classic several months ago (as account admin).  The problem is all maps for all users still default to "Open in Map Viewer Classic".  This is causing major problems with many users.  How do I fix this?  It affects both old and newly created maps.  I have tried turning on map viewer classic, and then turning it back off again for the organization but it didn't fix this issue.  Any ideas?

[JonathanMcD]

@DanAllen 

Sorry if this sounds just too basic (as bad as "have you switched it off and on") have you cleared out browser caches?
If you open the map in Viewer and then save it once again or rename it, do you get the same defaults to classic?

Under the Map - Settings page - what are the settings in there?