Apple Logic Pro /LogicExpress Discussion

Hello Everybody,

I recently noticed that there are gaps in drum kits in EXS24... I 
mean there are keys that do not play even though adjacent ones have 
their samples. I'm not sure if it was so earlier but I have a strange 
feeling that my EXS lost some of the sounds... Moreover there is not 
a single sound when I play one of the instruments which - I'm pretty 
sure - used to work properly (it's something called like "clouds" as 
far as I remember).

My question is: have You experienced something like EXS losing the 
samples? And is it possible to install only this sampler with its 
samples resources from the Logic CD without touching the whole 
program itself?

I'm not a very experienced in Logic and Mac in general so maybe the 
last question was stupid... But I'd like to hear from You before I 
start experimenting. By the way - the same question about Apple Loops 
Utility: I'd like to reinstall it because every third time when I use 
it, it sees no waveform (or sees an audio clip as blank).

All advice will be highly appreciated! Thanks,

Marcin