I tried 6.1 yesterday, one pool Ahashpool.
Benchmakr finished successfully.
Today in morming I see that few hours MM mined x17, it's usually most profitable.
Then PHI, it's sometimes also profitable.
But last 2 hours MM mined "xevan" algoritm.
x17 and PHI are disapeard from the available list (on main MM screen).

Only after restart of MM - x17 and PHI were available again.

So for some reason these algoritms were removed
and problem - they not came back automatically!  (after each 1800 sec rescan)
Only need to restart MM.
I think same problem was and with version 6.0. (no problems in 5.X)