It's fairly apparent by now that the latest Verizon update causes problems for people to send texts. Particularly in terms of the sending icon just circling/animating over and over without proof of sent. Sometimes it works. Sometimes it doesn't. Third party apps or not; this is an issue.
Also apparent, by discussion with friends, and researching online, this is a rather vast problem impacting many.
Curious what Verizon's plan is to fix as various hard resets, removing batteries, deleting various cache/data, trying different texting apps do not fix the problem.