Mhalix

No clue what is going on but all of a sudden every single time I edit a video and export it there is then no sound at all when I go to play it back, Even though before exporting the video it had sound in the preview, I have tried making 4 different videos just now and when I export them there is no sound on any of them even though they all have had sound in the previews, Can anyone help ??? Is this a issue with the free version or something else potentially