Notification for SMS does not work -- please help!

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http://forums.androidcentral.com – Just in the past week I have stopped receiving notifications for SMS on my HTC One. The messages are there, but neither the flag nor the LED appear, and no sound. It worked fine up until a few days ago. I get other notifications for e-mail, etc., and alarms. All sound settings work. I have tried a hard boot, and it will come back for a short time, then disappear again. I do not have Go loaded. I have not loaded any new apps recently. Aside from personal use, I count on being able to respond to work-related texts promptly. . Any help is greatly appreciated! (HowTos)