I had??never heard of it.??But I predict a pandemic as soon as it makes the New York Times style section.
But what if the second version of the problem makes about as much sense as the first? If the mere sight of it causes a fluttering heart and sweaty palms? What if there is confusion between the 9 and 6 on the one hand, and the addition and multiplication symbols on the other? Or 23 is read as 32? Or the numbers and symbols are identifiable, but how to begin the problem is a complete mystery?
Update: Wikipedia tells me that perhaps 5 percent of the population may be dyscalculic.