Same here. Vanguard not downloading since Dec. 22nd. Mine uses Direct Connect. No warnings on VG website.Q-2017 on Mac.What's going on?
Maybe this might explain:https://getsatisfaction.com/quickencommunity/topics/unable-to-update-all-accounts-in-quicken-for-mac
What version of Quicken are you using on what operating system? What is the connection type (check the account's settings)?What happens when you try to download? Is there an error message? If so, please post a screenshot of it.