Error exporting simple mesh.

It started with a rigged animated character, and I kept stripping things away until there couldn’t really be much else wrong with it. Now I just appended the mesh itself into a new file, and tried exporting it, and I still get this error- anyone know what’s going on?

Exporting the Suzanne monkey mesh works fine.

Settings for export not found. Using defaults.
Traceback (most recent call last):
  File "C:\Documents and Settings\Raz\Application Data\Blender Foundation\Blende
r\.blender\scripts\chicken_exportR76.py", line 857, in button
    self.buttonFuncs[evt]()
  File "C:\Documents and Settings\Raz\Application Data\Blender Foundation\Blende
r\.blender\scripts\chicken_exportR76.py", line 713, in fExport
    self.doExport()
  File "C:\Documents and Settings\Raz\Application Data\Blender Foundation\Blende
r\.blender\scripts\chicken_exportR76.py", line 402, in doExport
    o.write(buffer)
  File "C:\Documents and Settings\Raz\Application Data\Blender Foundation\Blende
r\.blender\scripts\chicken_exportR76.py", line 1414, in write
    self.writeInner(buffer, padding)
  File "C:\Documents and Settings\Raz\Application Data\Blender Foundation\Blende
r\.blender\scripts\chicken_exportR76.py", line 1451, in writeInner
    p.write(buffer, padding2)
  File "C:\Documents and Settings\Raz\Application Data\Blender Foundation\Blende
r\.blender\scripts\chicken_exportR76.py", line 1860, in write
    ln.append('%s<Scalar> alpha { %s }'%self.alphamode)
TypeError: not enough arguments for format string

Updating from R76 to R81 fixed it.