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Not sure if its compatibility issues but seeing as W10 is still pretty new, a few teething problems are to be expected.
Chrome has Flash in built and usually automatically updates itself so it should be that if you are using chrome. But if you also use Firefox, making sure you have the latest Flash update wouldn't be a bad idea.
Candy Crush should be installed onto W10 as standard, have you tried playing straight from the app instead?
Now there is a native windows app in that win appstore or whatever it is named,
the app has bonus levels that the Facebook and king.com version lacks.
if Candy Crush Soda Saga don't cope well in your browser. :-)