I forgot to say:
If your problem is the initial loading of the campaign, then - unfortunately - you must throw away all your savegames where you did already start 'Happy Times' and load the last savegame which will start 'Happy Times'. After loading that one, just do as I have explained above to correctly initialize the campaign chapter.
This may also be of interest to you:
I have made a tutorial (guide) about how to start at a specific campaign chapter, in your case how to start at 'Happy Times'. My guide is here:
http://www.subsim.com/radioroom/showthread.php?t=236272