Lion Finder windows close on shutdown

[benwiggy]

There's been a lot of effort expended trying to stop OS X from re-opening windows, with Lion's new Resume feature.

But one app that has traditionally always re-opened its windows is the Finder. However, I find that frequently after restarting, I start out with no windows in the Finder.
Anyone else get this? I've made sure that the "re-opn windows" box is ticked in the shutdown dialog.
The Finder windows aren't displaying external drives.
I've trashed com.apple.finder.plist
I can't see any plist commands that might be causing this.

Sometimes, at startup, Lion shows a "flash" of all the old windows before they seem to be re-loaded into memory. i.e. there's some sort of cache which displays all the old windows but they're not ready to be clicked on and the applications may not even be loaded yet.
Occasionally, I get a "flash" of the old windows before they disappear and leave me with an empty desktop.

All other apps restore their windows and documents as expect. And it doesn't always happen in the Finder.

I get this on two Macs, both running 10.7.3.

Any ideas?