I haven't had a chance to review the parts in that library, unlikely I will. But here is where i would start looking:
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Where are the origins to the part? If the origin (i.e. co-ordinate 0,0 in the symbol or physical library) is far away from the center, then Eagle will select all sorts of other things before you select the right part. The further 'off' the center point is relative to your symbol library, the worse the problem.
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Have you tried deleting the entire symbol screen? If it disappears then, situation 1) may apply.
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Is the part locked? Do a 'i' command followed by clicking on the part to see if it is locked or not.
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Contact cadsoft support and see what they think. Their forums are pretty good.