Problems after installing a build

[The Chef]

Force close Kodi. Then clear Kodi cache.
More:
If you install another build or update your build, and skin doesn't work, sections are missing, or you have similar issues, there might be fragments in your userdata folder and you should clear device data and reinstall the build.
Click here to read about Clearing data on Android and FireOS. Remember to unplug firesticks for 10 seconds after clearing data.

The full troubleshooting list, try these in given order -if one doesn't work, try the next.
1 Unplug device & router for 5 minutes.
2 Clear data & reinstall build.
3 Clear data, uninstall & reinstall Kodi and reinstall build.
4 Factory reset, install Kodi & build.