On my samsung galaxy s3 mobileminer don't remove hosts from the list.
I delete some hosts but when I click refresh they appear again. So changes don't save.
Deleted machines re-appear once they submit work. Are you sure the machines you are deleting aren't still submitting work?
And also I have a problem - no notification even after I bought the program in Google play.
First I've heard of this issue. What did you try in order to test this, and how long did you wait? Notifications go out every 15 minutes.
If you are still having issues please PM me your MobileMiner application key - thanks!