Courses won't upload to review

After spending an hour and a half troubleshooting and trying every solution I could find in these discussion threads, I finally found a solution. Since the problem is with the internet connection, I unplugged my router and modem, waited a minute and plugged them back in - FINALLY, Articulate was able to Publish again! Hope it's helpful for others.

Note: If you're working somewhere that you don't have access to the modem and router, try publishing from home or a coffee shop.