I'm sorry to start a new topic for just a ridiculous question but I've been surfing this forum and the web for three hours without finding an answer to my problem.
WHAT I DID:
I've put the file in the Cycling'74>msp-externals folder, and the help file in the Cycling'74>max-help folder as I successfully did on my old computer months ago.
I also tried a bunch of different location also trying to force the loading by setting the externals path inside Option -> File preferences...
1 - I open max and try to create a new object called [xgroove~] which is part of the xsample external; but it doesn't work and I have a solid outlined block with no inlets and outlets.
2 - If I make an object called [xsample] I have the same not recognized block but on the max window I see that max has loaded the xsample externals and all its friends.. Then if I make the [xgroove~] it works perfectly, but the xsample still remains orange/red colored.
3 - If I save the file with the two objects, quit max and launch the file again, Max doesn't recognize the objects but the Max window tells me that the external was loaded correctly...
4 - When Max tells me that the external has been loaded the help file works.
Max version: 5.1.4
Computer: Mac OSX 10.6.3 - Intel Core i7
Thank you everybody.