Can't push & twist on
I am having a problem turning on my Nutribullet. It had been working fine but I can no longer push the cup down & twist it to turn it on. There are white tabs that should be moving up & down when I push down but they won't. If I use a butter knife to force them down, I can get them to move but they are VERY stiff and I still can't push the cup down...
Any ideas would be appreciated.