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I am having an identical problem since the last software upgrade, and have tried all the steps mentioned. No luck. Seriously annoying. Let's hope the next upgrade fixes this while I use Hangouts as the alternative in the meantime!
Have you tried to restart your device?
Check in safe mode:
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008
Not sure this work or even if you have tried but open Settings then Apps and swipe to all then locate and open Messaging - Tap on force stop, Disable, clear cache and data maybe not in that order and then reboot
If none of the above help,try to look through your messages,there might be a chance it goes away.
Don't forget to mark the correct answer and if you found any answers helpful then click the kudos button
oh and glad you got it sorted