I seem to be having the same problem as this gentleman here in this conversation link:
http://www.magix.info/uk/how-to-use-the-12-gb-independence-content-library.knowledge.665304.html
It was to do with the Independence library content in my 2 disc 2013 edition of samplitude.
I have followed the advice that is provided in this link, and the discs worked whilst downloading, but I cannot find the sounds that I have uploaded onto my computer. I then looked at a previous comment to upload the independence library audio through VST plugins and the effects panel, but this has not worked and have tried adding them manually, but this still hasnt worked.
Hope someone can answer my querie soon.
Cheers