@AZgl1500 I've turned off all stock messaging app notifications and uninstalled. I then re-installed Chaton. Once I did this I opened Chaton and sent a message to an existing contact. I then went to my default messaging app settings and there was no options. I also had someone send me a text that is using a stock messaging app and I didn't receive their message.
I've also tested leaving the default messaging apps installed but turned off their notifications. No luck.
I did download GoSMS Pro and this app shows as an available option in my messaging defaults.
Could the issue be the Andriod version I'm running? I have a Samsung Galaxy 5 and running 4.4.2.
Thanks for your assistance!