On what computer operating system is your Premiere Elements 12 running on?
Are you aware of the "Content Download" setup in Premiere Elements 11, 12, and 13?
When you open the program, are you saying that there is nothing under the Instant Movie, Tools/Movie Menu, Text & Titles, Audio, Graphics Tabs?
Please read my Premiere Elements 12 First Look blog's section on Content
Are you in the Expert or the Quick workspace of the program. In the Quick workspace, you cannot access all the Content that is in the Expert workspace.
Is this a problem 'they were there before but not now" or " they were never there ever"?
Please review and consider. We will be watching for further details.