I have a Samsung Galaxy S3 and I have this problem. When I send something through my laptop on AirDroid, the little "envelope" icon thingy in the message box keeps coming up saying the message is being sent. And if I look on my phone, the "sending ring that goes round and round" icon keeps appearing next to my text message as if it's trying to send but doesn't. This will go on forever.
I have notice that if I am signing on to AirDroid the first time of the day, everything will work fine. But as I use AirDroid throughout the day... it eventually will not work. I have notice this happening almost immediately when I first using AirDroid 4 months ago. Since then, the amount of time that AirDroid will work for me in one day starts to get shorter and shorter.
I just want to say I love this program and I would even pay money if I had to. At my work I am a scheduler and coordinator and I text all the time. Having this program has made my work life so much easier.... that's when AirDroid actually works. Otherwise, it takes more time backing up and resending my texts every single time. I have disabled adblocker. Let me know if there's anything else I can do or if this is a bug that is waiting to be fixed with the next patch!
Lilysprouts
UPDATE 11/15/2012: Don't know if this will help anyone out there, but I have found out lately that if I try to send out more than 150 letters (including all spaces) then it won't send. It will just say my text failed. I don't know if this is a new feature or has always been in place... but if I send under 150 letters then it will go through just fine. I want to say this is a new feature because I do recall that I use to be able to send multiple texts at once successfully. May it's a "safety feature" that makes it so you don't bombard people with a huge text. Whatever the case, if I keep it under 150 I'm good.. for now at least...
Lilysprouts