Cannot Use Services for Some Apps

Lollipop on Galaxy S5.  I have three apps that I am trying to allow Services on.  When I go to accessibility and try to turn on the services, I get a panel that tells met that (app) wants permission to do ....  When I hit OK it won't respond - the only way out is to cancel.  I want to use these apps but am unable to.  They were OK under KitKat.  Lollipop is getting very frustrating.  Wish I could go back!