Hi Future Aztec,
Thanks for your message.
Since you’ve successfully unlocked the feature set of Cubasis LE, you’re entitled to see and purchase additional in-app purchases.
So far we are not aware of any in-app purchase issue, neither with Cubasis nor Cubasis LE.
Please have a look at the following Apple article, which hopefully helps to get around the issue:
Please keep me updated.
Best,
Lars