In my case (Ubuntu 14.04) the error persisted until the following was done, in this specific order :

• Restart Odoo Server

• Upgrade my module :
  

                        - Go to the Apps page

                        - Cancel the Apps filter in the search bar

                        - Type the name of my module instead of the previous Apps filter

                        - Click my module (this open my module administration page, allowing me to upgrade it)

                        - Click upgrade

Then all my updates seem to be present in my module.

Hope this will help someone.

First of all check if you have an error in your syntax.

Since odoo wont update the module if an error is found.

when restarting odoo try odoo.py -u <modulename>