Dropbox's service for synchronizing and sharing files experienced problems starting on Friday and extending to Sunday.
"We're continuing to make progress on reducing the number of users experiencing service issues," Dropbox said in a blog post late Saturday night, but on Sunday, some problems such as photo sharing folders persisted.
In an apology to users, the company said Saturday night that people's data is intact:
No files were lost in the outage, but some users continue to run into problems using various parts of dropbox.com and our mobile apps. We're rapidly reducing the number of users experiencing these problems, and are making good progress.
We're also working through some issues specific to photos. In the meantime, we've temporarily disabled photo sharing and turned off the Photos tab on dropbox.com for all users. Your photos are safely backed up and accessible from the desktop client and the Files tab on dropbox.com.
The continuing problems are less severe than the outage that afflicted the service altogether on Friday.
The problem was caused by routine maintenance, the company said Friday night, adding that "claims of leaked user information are a hoax."