> When I already have downloaded FOUR project, I can 
see 
> in 'Index of locally available projects' links to 
> three of them, I can't see the Fourth link...

There may NOT be a valid index.html page in the 
project folder? This is generally the problem 
(example: interrupted mirror, or no index option 
selected)

Try to mirror another (small) project site to see if 
this happend again (you may delete it after testing)