Hi Ernie,
I noticed a minor bug in the latest version with combination decks, using Spaced Repetition.
I cleared the combination deck, so that it showed no cards due, but the decks in the combination deck still showed one card due on the main screen. But when I opened them, they had no cards due. Going back to the main screen then showed that deck as having nothing due, but the others still showed one card due.
I exited the application and then went back in, and the main screen was then correct.
-paul