I notice that netrw plugin v146 which comes with Vim by
default no longer works in Vim-7.3.782. It does not open
directory when pressing Enter on a directory. 

It started to be broken in this recent changeset 3920:c53344bacabf
which upgraded netrw:

Vim-7.3.716 (3920) (netrw v146) ...... broken
Vim-7.3.715 (3919) (netrw v145) ...... OK

I also tried to install netrw v147d 
from www.drchip.org/astronaut/vim/index.html#NETRW
but it's also broken (same bug).

What steps will reproduce the problem?

1. Use the following minimalistic ~/.vimrc

$ cat ~/.vimrc
filtype plugin on
let g:netrw_liststyle=3

2. Run vim with:  vim ~/

3. Move cursor to a directory and press Enter.
   Observe than directory is not opened.  
   with Vim-7.3.782.  Directory was opened
   with older Vim (<= 7.3.715, netrw v145)

What is the expected output? What do you see instead?

Vim should open directory when pressing Enter
but instead nothing happens.

What version of the product are you using? On what operating system?

Vim-7.3.782 (huge, gtk2) on Linux-x86_64.