Test & their missing buttons in html

Hi, this is my last attempt to solve this problem I'm having with Lectora, before I officially quit my job and become a guinea pig farmer....I have a number of courses that have 2 or 3 tests included (in a separate chapter). All questions within the test are built in exactly the same way and when viewed in Preview mode or are published to exe, work perfectly fine. Yet, the minute I publish them to html or SCORM to go on the LMS, the test develop a mind of their own.The question pages suddenly don't have a Next/ Back/Done button anymore, the pictures don't display and they almost look like the page content is being blocked by the web browser or something.I have spent days now trying various different things and nothing works. Help!Simone