* Problem with focus lost in demos. This happen
  when open a new window. See transforms an open
  the option menu, a leave/enter for mthe main
  window is needed to reactivate the keyboard commands.

* The 'all_options' demo work stand alone but
  has a problem with creating additional windows
  under zinc-demos. A rewrite is necessary

* The Tcl version has not been tested for a while. It
  may not work.

* Images/Fonts are not handled correctly under the windows
  Exceed X/openGL emulator.

* Reliefs are not properly closed on closed curves in some cases.

* When using a display area over 1280x1024 with openGL/nvidia
  the redrawing may be incomplete leaving an undrawn band 
  on the right of the window. It may also crash the process.

* When using openGL/Mesa -linewidth between 4 and 10 crash the X
  server

* When using openGL/Mesa (and may be other configurations), Zinc
  fails to detect if the GLX extension is not available in the serve
  and crashes.