Finally some other people noticed.
It has been behaving strangely since this morning!
I bragged that I have lots of experience in mining, but what I see is a first for me,.. no EXPLANATION at all.
It is as if someone is mining the coin while hiding the hashrate.
Blocks are still found but ..
ultracoins.info : Next Network Block 445,982 (Current: 445,981)
ultracoinpool: Next Network Block 445,984 (Current: 445,983)
Last Block Found 445,932
Time Since Last Block 29 minutes 45 seconds
Looks like a fork to me.