gvim 7.0 does not display files in the same directory again

[PoWah Wong]

When I use gvim to open files, the first time it will display all the files in 
the directory A.
 After I open a file, when I try to open files in the same directory A,      
 it does not display any files, i.e. the directory A is displayed as empty.
 I have to display the files in another directory B (e.g. parent directory), 
then it will display all the files in the directory A.
 gvim version is 7.0.  I download source code and compiled it.
 Linux is Red Hat 7.2 (2.4.7-10smp).