On 2018-05-15 a new version of Atlas, the Athera storage system, was deployed. This version provides a huge performance gain. In the process of developing it we discovered some issues with Dropbox (case-sensitivity) and Google Drive (versioning). We're fixing these and will restore Dropbox/GDrive access as soon as possible.
UPDATE 2018-06-08 12:10 UTC
Dropbox functionality has been restored. Google Drive will be reenabled in approximately 7 days