It may also be that the audience hasn't had enough time to internalize your material in a way that leads them to even have questions. People who are interested in your area may have to go home, find a copy of your paper, and study it heavily before they can even formulate a question. I always work, when I'm session chair, to develop at least one or two questions to seed the Q&A part of each talk and try prompt some discussion. Even if my questions are kind of lame, they may spark some ideas in others (as well may your answer!).

It may also be that the audience hasn't had enough time to internalize your material in a way that leads them to even have questions. So one piece of feedback that you may take is that you have pitched your talk at too high a level and assumed too much knowledge about the subject in your audience. If that's the case, you may try bringing the level of your talk down a small notch to accommodate.

Also, depending on the niche that your material covers, people who are interested and well-versed in your area may have to go home, find a copy of your paper, and study it heavily before they can even formulate a question. I always work, when I'm session chair, to develop at least one or two questions to seed the Q&A part of each talk and try prompt some discussion. Even if my questions are kind of lame, they may spark some ideas in others (as well may your answer!).