24 Bit X-terminal error

We recently tried to run GRASS on a ShoGraphics X-terminal, model PS1. This
is a 24 bit color device. We received the following error message when
the d.mon command was executed:

   Graphics driver [x0] started
   Please start graphics monitor <x0>.
   X Error of failed request: BadMatch (invalid parameter attributes)
     Major opcode of failed request: 78 (X_CreateColormap)
     Minor opcode of failed request: 0
     Resource id in failed request: 0x27
     Serial number of failed request: 225
     Current serial number in output stream: 226
   Error - Graphics monitor <x0> not running!
   Problem selecting x0. Will try once more
   Please start graphics monitor <x0>.
   Error - Graphics monitor <x0> not running!

Any ideas?
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