MarkIt Up 1.1 was approved by Apple yesterday and released to the masses. I found out this morning that I sent an old(er) build to Apple.
The issue occurs when you perform a calculation and then tap the results to perform another calculation on the results. The number put into the price field is in the wrong format and causes an error.
The good news is that I submitted an update to Apple (last night) which has some new features and should fix this issue. I hope that Apple approves the fix shortly. I have a feeling that the update will be approved by Apple in a week or so.
Please bear with me until Apple approves the fix. Thanks.