After upgrading Jenkins from 1.658 to 2.7 and Dashboard View Plugin from 2.9.7 to 2.9.10, the folders do not appear in a job list created in the Dashboard View.
Steps to reproduce :

• Jenkins with Folder and Dashboard plugins
• Create a folder
• Create a dashboard view and use regular expression ".*" to include all jobs.

Playing with other filters, or manually selecting the folders to display doesn't work either.