We are installing Windchill Workgroup manager for AutoDesk Inventor 2012 on machines running Windows 7. We added some buttons tothe ribbon in the Get Started Tab and the Model tab on the ribbon. However when we shut down Inventor and then restart it the icons are loaded as symbol "@" and the text is gone. The buttons still work (when you press them they do what they are supposed to do), but you cannot tell which button you are pushing (unless you have the locations memorized).
We can get them to regenerate when we open the Custom User Commands dialog box and make any change that makes the Appear button un-grey in the lower right.