I used the time trick to skip over waiting time and then put it back to normal time (I was not stocking anything when I did this) I did lose 1 Bitizen in a time travel accident, and my sales per minute is stuck on 0.00- How do I fix this? I am playing on my iPhone 4S
Check the App store for upgrades to be sure that your Tiny Tower is the latest version. Then Restart the Tiny Tower app in iOS.
If that doesn't do it, wait until the correct time naturally passes the latest time from your time traveling adventures. This may be a new time travel bug.