Navigation doesn't work in netrw tree mode

[GoogleCodeExporter]

What steps will reproduce the problem?

Case 1:
- Open netrw (run ":E").
- Switch to list mode (press "i" 3 times).
- Go up one directory (press "-").

Case 2:
- Open netrw (run ":E").
- Switch to list mode (press "i" 3 times).
- Place the cursor on a directory and press enter.

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

Case 1: The tree should go up one directory, but the entire buffer goes blank 
instead.
Case 2: The selected folder should expand, but nothing happens.

What version of MacVim and OS X are you using (see "MacVim->About MacVim"
and  "Apple Menu->About This Mac" menu items, e.g. "Snapshot 40, 10.5.6
Intel")?

Snapshot 66 on 10.6.

Please provide any additional information below.

Installing the latest netrw into ~/.vim fixes the issue. The copy bundled with 
MacVim seems quite out of date. This problem does not occur with the earlier 
version I was using, which I believe was build 53.

Original issue reported on code.google.com by jaredoco...@hotmail.com on 29 Jun 2013 at 6:07

[GoogleCodeExporter]

I saw the same two issues, and same fix worked.  Also on snapshot 66, on iOS 
10.8.4.

Original comment by cesh...@swbell.net on 11 Jul 2013 at 11:09

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[GoogleCodeExporter]

Try the latest snapshot (68 at the time of writing).

Original comment by bjorn.winckler@gmail.com on 12 Jul 2013 at 7:55

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