Text are sometimes not going through after the KitKat 4.4.2 update. I have did everything from doing the force stop/clear data of the messaging app to a factory reset and are still having the issue. I have spoken with Verizon Tech Support and am waiting to here back from them what they are going to do to fix this issue. Have also noticed that my texting is lagging as I am typing a message as well, that issue started a few days after the update.
When I spoke to customer support the first time about this issue they had stated that only one other person with a Galaxy S4 was having this problem and they had not updated there device yet. Seems like more than one person is having this problem.