Yesterday I try to access to a folder , of another Dropbox user (my sister) and I can't see any files inside this folder. And I realize that I can't see any of my own files in my own folders if i try yo see this by the dropbox web site!!! Today, it continues in the same way: I can see the files in my dropbox folder in my PC, but I CANNOT SEE ANY FILE in the web. What can I do to solve this problem? Thanks!