Sorry to hear that. Try this:
- Close other apps that may be running.
- Close the Nick Jr. App and open it again.
- Try restarting your mobile device and opening the Nick Jr. App again.
- Try opening another app that has video. Do the videos work in that app?
- Check that your device meets the minimum system requirements for the Nick Jr. App.
- Check your Internet download speed. You'll want download speeds of 1.5 Mbps or faster. (You can download a free app that will check your internet speed.)