can.s select answer on test questions

I'm having a problem with a test that I've been working on. I'm publishing to AICC and everything was working fine, but now I am not able to select an answer on any of the multiple choice questions. I click on all the radio buttons and am not able to select any of them. When I click the submit button, it takes me to the next page of the test without any feedback (normally there would be an error telling me that I have to answer each question to proceed).Earlier in the course there are some multiple choice quiz questions which are not being scored or reported to the LMS, and they are still working fine.As far as I know, I didn't change anything in the test when I started having this problem. I'm relatively new to Lectora and to working with an LMS. Has anyone else encountered this problem?