Same problem here, as i see, the problem is with liqpay, i've already written to them (support@liqpay.com), but they are just sending test messages, which are working fine, and telling me to restart my phone, delete old messages, etc..
There is an online help section in liqpay, you can also send test message from there, and it's also working. BUT, if i go back and try to pay, no SMS is coming through from there. I have also tried with firefox and chrome, no luck.