I have exported one of the library image (the second magi in Christmas category). When I try to open it in AI CS51, it gives me the error "The operation cannot complete because of an unknown error. [PGFp].
Here are the workarounds:
1) open it in inkscape.
2) delete the i:pgf tag in the svg file by using a text editor
I confirmed the details and passed to development to fix the issue.