Netrw tripping over itself: tree-view, modified buffers, and disregarding the `hidden` option

I'm running into a two-part problem with Netrw:

1. Netrw is ignoring the `hidden` option, so even though I have `hidden` set, it won't open a buffer in the previous window if that window contains a modified buffer.

2. In "tree" view, the explorer buffer often gets marked as "modified", preventing a buffer from opening in the current window.

I can illustrate with this minimal .vimrc,

set nocompatible
set encoding=utf-8
filetype plugin indent on
set hidden
let g:netrw_liststyle=3

and the following workflow:

- Start Vim
- Insert some text
- Run `:Vexplore`
- Navigate the tree to an existing file
- Hit `P` to open it in the previous window

Because it isn't respecting the `hidden` option, Netrw won't open the file in the desired window, and instead tries to open it in the current one. But the Netrw buffer occupying the current window has somehow become marked as modified, so Vim displays the following prompt: "Save modified file<NetrwTreeListing 1>?"

While issue #2 is a bit of an edge case, #1 is a significant problem for me. Is Dr. Chip out there? Is anyone else having this problem?

Version info:
Vim 7.4 (2013 Aug 10, compiled Oct 23 2013), MacOS X (unix) version, Patches 1-22, Compiled by Homebrew, Huge version with MacVim GUI

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