You're definitely not the only one having problems with this year's version. It's dire compared to previous years! I've been using Turbotax Online since 2017, at least, and this is the first year I've had to restart from scratch due to bugs/glitches.
It was working normally, it seemed, up until I got the same "puppy dog" error page you describe. Since then I've tried restarting my return on a different browser, with freshly cleared cache (which wouldn't make any difference anyway, since that's unique to the browser, but did so anyway to be thorough) and no adblockers or the like, and it just won't accept entries in the business use of home "Other expenses (if applicable)" section... Going to look into what alternatives there are, tomorrow, I think.
