Its been more than a day that public nodes respond with:
for N in {1..100}; do curl --silent "http://node$N.nxtbase.com:7874/nxt?requestType=getState" | python -m json.tool | grep '"lastBlock"'; done
Other nodes that accept public request returns, what appears to be a valid lastBlock...
However, all public
node*.nxtbase.com nodes,
for days, still returns same lastBlock 2680262203532249785.

I'm working on this. They seem to have gotten stuck after the upgrade yesterday.