No, it works fine (sometimes) on a Mac running Safari.
And, if you are getting the Domain Error problem, just keep reloading and trying again.
My experience:
1) worked fine at first
2) then got Domain Error
3) then after about 3 or 4 reloads, works fine again. I did NOT do anything fancy, like block / un-block pop-ups, clear cookies, or history. Just re-loaded a few times.
So, don't give up.