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  ,using a machine with less than 8 bit color, run?
 
 Tk doesn`t behave very well with less than 8-bit color screens.  To
try to use it, find all the places in the Tk/wish source where 
DefaultDepthOfScreen is invoked to test the number of bit-planes.  Change all
of these to pretend there is just 1 bit-plane, or call a procedure which
monitors a Tcl variable so that it is configurable, and you should be okay.

Another alternative is to see if the server you are using has alternative
visual / color models, such as static visual, etc.  One of the alternatives
may allow Tk to work better.

Thanks to "Nathaniel Borenstein"  for this info!