I, too, have a preference for PC, and have had all the same troubles in the past few days. Mobile worked fine, PC app....
Over and over, yesterday. I even took to the forum to start posting each time it crashed... big surprise... that thread was locked.
Update from today seems to have fixed things. Over 3 hours in for the for daily playtime rewards. Not a single issue.
Some one at Plarium figured it out :)
I hope it stays that way... but as a software engineer... I understand. Bugs pop up, even if you have loads of unit and regression testing. Anyone who has ever written a unit test using Mockito, or other similiar libraries, knows that a "mock" object is only as smart as the programmer coding it.