[Wine] "BadWindow" error w/ NV-GLX

[Jing Xue]

Running wine 0.9.28, Ubuntu Edgy.  nvidia 6800GT, dual-LCD w/ xinerama,
nv-glx driver.

Running winecfg always returns:

wine: creating configuration directory '/home/myusername/.wine'...
X Error of failed request:  BadWindow (invalid Window parameter)
  Major opcode of failed request:  144 (NV-GLX)
  Minor opcode of failed request:  4 ()
  Resource id in failed request:  0x24a
  Serial number of failed request:  19
  Current serial number in output stream:  19
wine: wineprefixcreate failed while creating '/home/myusername/.wine'.

And after a couple of seconds:

wineserver: could not save registry branch to
/home/myusername/.wine-5OxLEo/system.reg : No such file or directory
wineserver: could not save registry branch to
/home/myusername/.wine-5OxLEo/user.reg : No such file or directory

No errors found in Xorg log or .xsessionerrors.

Any pointers would be much appreciated.
-- 
Jing Xue