Plugin no longer see through ftp documents in folders

Hello,
Faced with a problem after updating to the latest version of the plugin WP Download manager, his no longer see the files that are on the FTP, it shows the presence of folders, but they are all empty, in what could be the problem?
P.S. before that worked all right, help with the decision))

Thank’s
Ekaterina

Tried to uninstall and reinstall the plugin, everything remains the same… But there was one odd thing, the plugin was showing an empty folder, until I added a file with the pdf and after that the plugin started to show all the files contained in the folders, don’t know how it relates?)