If there is an event currently running in which you are supposed to be able to receive a boost such as your supplies not diminishing, etc. - try completely closing and restarting the game. The effect of the event should then take effect.
Make sure you are completely closing the game; not just letting it run in background:
To close on Apple devices:
(Double tap home button to see apps running. swipe the upwards with finger to clear from memory.)
To close on Android devices:
(in your device Settings/Applications Manager/Running/Close running apps, or using a Task Killer)