Handcent Group SMS error on send

I have a Samsung Nexus S phone, running the current version of Jellybean, with the Handcent SMS app and Group SMS add-on installed.

I have trolled through every conceivable setting, and the Handcent website, and cannot solve this. Messages to them have thus far not been answered.

About once a month I need to send a text message to a group of 44 people.

No matter what I have done, the app issues a pop-up before every message saying that I am attempting to send a large group of messages, and asking me to allow it to proceed.

If it presented this pop-up once I would have no complaint, but it comes up over and over, until each message has been individually allowed to send.

Am I missing something? Or is it just a crap bit of software?