problems with itunes match

Hello,

i have problems with my itunes match. I will explain what happen:

The main multimedia computer is a mac mini with the whole music stored in a time cpasule in exclusive use for music, in this computer i save all my music and i have all my music.

But then i will update music match, and it works fine, but some songs are not copied or stored in the cloud. I mean that the aviaible songs are in black and some songs saved in my itunes are in grey and i can´t listen to it (in the mac mini i have that songs and i can listen to it).

I´m not talking about very strange groups or something. I mean something like "The Prodigy" and more.

Why there are some songs aviaible (most of them) and some not? In the mac mini I have round about 5.800 songs and in the other mac with itunes match only round about 5.500 usable songs. Why? I can´t understand it.

There also another problem, for example the spanish group Vetusta Morla, first i had the last album in all my mac with itunes match, and now, nothing... the songs are in grey and i can´t listen to it.

Please help me and find a solution.

Thanks!

Best regards,

BJM32