Cash donation limits?

Am still having trouble reconciling why TurboTax is not allowing all of my cash donations. There's plenty of publications to read, but none of them explains my problem. My wife and I are filing a joint itemized return. This year is different from most years in that our Adjusted Gross Income is around 75,000 and we have cash donations of around 40,000. TurboTax is allowing only 12,000 in cash donations. One of our cash donations was to a church for 24,000 (all by itself = just one check). In effect, TurboTax is denying roughly 29,000 of our cash donations. We can't afford to let this drop. We need to get it fixed or understand exactly what's going on. None of the publications have helped. Do I have to go directly to someone at TurboTax? Am I going to get charged money to have someone at TurboTax explain/fix this?

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