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Settings-apps-all-messages,force stop and clear data. Restart.
Settings > apps > all > messaging > clear data > restart the phone
Do you have a third party messaging app?
Have you checked safe mode?
/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
Are you using the preloaded messaging app or a different messaging app?
Hi Chrisb78,
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You could try downloading an alternative SMS application, make it the default and then Disable the original app, once done Enable the app again and then make it the default SMS app and then remove the downloaded app, or simply continue using it.
I hope this helps.