What issues have you run into when getting your prescriptions filled?

There are a number of reasons you may have issues getting your prescriptions refilled, including:
- The pharmacy unning out of stock
- Waiting to long to get a prescription filled
- Trying to refill a precription too early
- A recent move
- A different dosage or supply is required by insurance
- Being denied by your insurance
- A change in providers

Have you experienced any of the above? How did you manage?