No forcing of checkbox ticking working

Hi all.

I am definitely not happy about posting with this title or description because it amounts to "It doesn't work. Waaah."

The problem is, it doesn't work. If anyone could direct me to logs to check or something so I can troubleshoot I'd really appreciate it.

To be as descriptive as I can about what is happening:
1. Running plugin on buddypress 1.2.9 / wp 3.2.1, plugin version 1.2.2
2. Plugin insert TOS textbox and checkbox appropriately at on register
3. User can sign up without checking the checkbox and there is no error, warning, nothing, zip, zero.

4. Running with Membership plugin 2.0.7

thanks for reading!
(sorry in advance if this doubles another post but i couldn't find one)