It gets to about 20%, and then the export fails, though no error message is displayed. I tried changing the export location, in case there was some kind of conflict, but it still fails to complete.
Can you please upload your site on Business Catalyst and see if behaves similarly?
IF still, it does, then would you mind sharing your .muse file with me?
For sharing the muse file you can upload it to Dropbox or WeTransfer and send it across to me in a private message.
A private message can be done by clicking on my username and choosing "'message" option.
It was some sort of authentication error. When I tried to upload it to Catalyst, I actually got an authentication error, so I signed out, and signed back in with my account, and once I was able to do that, I was able to export the HTML. I guess maybe it was failing to get the adobe fonts, but it wasn't throwing a helpful error message. Seems to be ok now, though. Thanks for aiming me in the right direction.