Yep, we spell renaissance the same but usually pronounce it ren'-uh-zonce.
I say meh-di-eev'-al, but a lot of us say meh-dee'-val. I guess we really ought to pronounce it the way you do, (how do you say it?) as you guys were around then and we weren't! But fat chance getting us to spell it the way you do!
That's hilarious about Rosetta Stone. I haven't heard that error in their ads here. (Sorry, meant to say adverts.)
I do hope the BBC pronunciation of controversy doesn't result in ak-rim'-o-nee.