Logic Pro X unable to use lots of apple loops

bartdemylle

Logician
I've got lots of apple loops (audio loops) which I cannot use. Although they are in the same folder as the other ones, they are displayed in a dark way and I'm unable selecting them. Reindexing the loops does not change this behaviour.
What's causing this and is there a way to solve this problem?
I'm using Logic Pro X 10.2
 
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