I did find the Designer Beta and am using it. Specs are: MacBook Pro, 13" | Processor: 2.5 GHz Intel Core i5 | Memory: 8 GB 1600 MHz DDR3
I fiddled around with the preferences trying to promote speed rather than optimal image. Not sure if it helped. I've uploaded a file. This isn't the one that I need to work with the refine mask, but I used a mask in this, so it should illustrate what I'm having difficulty with. None of the options in there will work - feather, ramp, etc. I am a newbie, so I could be using it wrong.
Thanks for the help.