[Evolution] Can't send mail: "could not parse URL 'druid window'"

[chrisb wego com]

When I try to send mail, hitting the Send button yields the message:

  Error while 'Sending "subject of email"': could not parse URL 'druid window'

I'm using the snapshot of Evo from today (although I think this snapshot is a
few days old?).
I'm on RedHat 6.2, using Ximian Gnome 1.4, with all updates from Red Carpet's
Ximian Gnome and Evolution snapshot channels.  I have nearly all updates from
the RH 6.2 channel.