Try clearing the studio cache so the modules are refreshed.
Close Studio
In XP
Delete C:\Documents and Settings\USER_NAME\Application Data\SignageStudio.XXX
(USER_NAME = logged on windows XP user)
In Windows 7 / Vista
Delete C:\Users\USER_NAME\AppData\Roaming\SignageStudio.XXX
To get to this folder, Click on Start, and on the search field type %appdata% hit enter, and then delete the SignageStudio.xxxx folder.
Please let us know if it works.