The “business” and “personal” dropbox combo can become a real mess. Syncing quite often fails for small files too. I hope they will be able to pay some attention to these things in their nice new building.
I had a personal Dropbox account, that I upgraded to a business one (because I wanted certain of my devices to only have access to a subset of my files, for instance when traveling). Except that breaks auto photo uploading from mobile, so I reverted back to personal. Everything seems to have reverted, except the auto photo uploading tab, which now is stuck on telling me that I need to connect a personal account.
Keep in mind that this is one of only 4 tabs in their mobile app, so you think it'd get pretty thorough debugging. It blows my mind how so many companies can blow tons of money on useless signaling things (like the recent redesign) while neglecting to test very basic functionality of their product.