I was having a problem syncing Pocket when I checked the DropBox forums, FYI:
Please read this post before posting about service issues. January 10-11 2014
Dropbox experienced a service issue related to internal maintenance tonight. This caused the web site to become unavailable, and cause mobile client and desktop client sync to stop. Services are slowly returning, but you may continue to experience issues related to Dropbox services for a while. Please do not post additional threads about this issue, they will be deleted.