I have called support 2-3 times about this problem. It is hurting drop box reputation for reliability especially when the problem occurs during a critical communication with my clients. The problem: I have a pdf document to share with my client: I send an invite from my app or website and everything goes fine. Then I get an email asking me to approve the file I just sent to them!!! To make things worse, I then press the approve button and I get the stupid unicorn error. I was guided to an obscure unclear setting that worked once and then failed again. This is painful to users on both ends of the share process.
