Hello paragonflux,
Sorry to hear you are having issues with your comment text. I checked your site and was able to duplicate it on my test site. The issue appears to happen on themes that have dark text by default like Hifidel, Grid One, etc.
When you change the colors to a dark background with white text, the comment text also turns white. Then, in your comments, they appear to be missing because they are white text on a white background.
Themes with light text by default, such as Venetian, do not appear to have this issue.
I have submitted a ticket to the development team to correct this issue for themes that do this. Thank you so much for finding this and letting us know.
Kindest Regards,
Scott M