When using the talent calculator from the battle.net game guide page, I am able to use all classes except for priests. I'm not sure if this is the correct place to report this, but here it is.
In the mean time, they have one on Wowhead.com you can use... if you didn't already know that... .which you probably did.... but still!
I do use wowhead a lot, but I've never used their talent calculator, thanks for reminding me.
Thanks for moving this to the correct forum page, Peratryn (if it was you that did it). I didn't scroll down far enough on the forum links page, so I never saw "website and mobile feedback" and posted on the customer service page, instead.
The Priest Talent Calculator is still not working on battle.net. I tried the us.battle.net and the eu.battle.net and on different computers, and the Priest section will not display. I reported it through the link on the website.