VRDE/RDP fails to enable after installing extension pack

[wfaulk]

If the RDP-enabling extension pack is installed after the VRDE features are configured for a VM, it fails to use those configuration options.

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I recently installed VirtualBox 4.0.0 on a headless server and didn't realize that I had to install the extension pack. I had run "VBoxManage modifyvm <VM> --vrde on --vrdeauthtype null --vrdeport 3389" before installing the ext pack and the information showed up correctly in showvminfo:

VRDE: enabled (Address 0.0.0.0, Ports 3389, MultiConn: off, ReuseSingleConn: off, Authentication type: null)

but, of course, RDP didn't work. I then installed the extension pack, but there was no change in behavior. I had to run the modifyvm command configuring the VRDE options again in order for VBox to start listening for the RDP connection.