EXS 24 Logic Sampler Users Group

Hi chaps,
There appears to be an issue with the amount/Max no' of EXS instruments 
allowed in your EXS instruments folder. I am still on Logic 6 but could 
anyone shed any light on this: Strangely enough they appear in the EXS 
drop-down menu list within Logic but do not allow selection from this list.
My Sampler instrument collection appears to be too much for Logic..???
Thanks in advance for any light shed..
Sam