I've had a few people tell me that recently they tried to buy Cross Digits and it was not available on the store. So, I took a look and randomly it showed up in searches but would not allow a purchase. Thanks for taking the time to alert me to it!

Now it seems to be back to normal and able to purchase.
Also, there is an update on the way with iPhone 4 high-res images to make use of the great screen on newer devices.
Hopefully all is well for now!