i tried it too.
there is no rendering problem, and nothing in the console.

can you try out this example [ it is a newly generated qooxdoo app
Application.js file]:
-------------------------------------------------
/* ************************************************************************

   Copyright:

   License:

   Authors:

************************************************************************ */

/* ************************************************************************

#asset(for2/*)

************************************************************************ */

/**
 * This is the main application class of your custom application "for2"
 */
qx.Class.define("for2.Application",
{
  extend : qx.application.Standalone,



  /*
 
*****************************************************************************
     MEMBERS
 
*****************************************************************************
  */

  members :
  {
    /**
     * This method contains the initial application code and gets called 
     * during startup of the application
     * 
     * @lint ignoreDeprecated(alert)
     */
    main : function()
    {
      // Call super class
      this.base(arguments);

      // Enable logging in debug variant
      if (qx.core.Environment.get("qx.debug"))
      {
        // support native logging capabilities, e.g. Firebug for Firefox
        qx.log.appender.Native;
        // support additional cross-browser console. Press F7 to toggle
visibility
        qx.log.appender.Console;
      }

      /*
     
-------------------------------------------------------------------------
        Below is your actual application code...
     
-------------------------------------------------------------------------
      */

      // Create a button
      var data = [[1, 'First name 1', 'Last name 1'],
      [2, 'First name 2', 'Last name 2']];
      var model = new qx.ui.table.model.Simple();
      model.setData(data);
      model.setColumns(['ID', 'First names', 'Last names'], ['id', 'first',
'last']);

      var table = new qx.ui.table.Table(model);
      var columnmodel = table.getTableColumnModel();
      var barPlotter = new canvascell.plotter.Bar({
        fill:   '#ff0000',
        border: '#00ff00' 
      });
      columnmodel.setDataCellRenderer(0,new
canvascell.Renderer(barPlotter));

      var table2 = new qx.ui.table.Table(model);
      var columnmodel2 = table2.getTableColumnModel();
      var barPlotter2 = new canvascell.plotter.Bar({
        fill:   '#ff0000',
        border: '#00ff00' 
      });
      columnmodel2.setDataCellRenderer(0,new
canvascell.Renderer(barPlotter2));

      var doc = this.getRoot();
      var stack = new qx.ui.container.Stack();

      // add some children
      stack.add(table);
      stack.add(table2);
  
  
      var prev = new qx.ui.form.Button("Previous",
"icon/22/actions/go-previous.png");
      var next = new qx.ui.form.Button("Next",
"icon/22/actions/go-next.png");
      
      prev.addListener("execute", stack.previous, stack);
      next.addListener("execute", stack.next, stack);

      doc.add(prev, {
        left: 100, 
        top: 50
      });
      doc.add(next, {
        left: 100, 
        top: 150
      });
      doc.add(stack, {
        left: 300, 
        top: 50
      });
    }
  }
});
-------------------------------------------
just create a new qooxdoo app, replace Application.js contents with the
above, and make sure you have something similar in your config.json:
"libraries" : 
    {
      "library" :
      [
        {
          "manifest" : "contrib://CanvasCell/trunk/Manifest.json",
          "uri" : "../../../NetBeansProjects/qooxdoo-contrib/CanvasCell/trunk"
        }
      ]
    },

clicking next and previous works just fine.
maybe there is something in your app that does something, or maybe another
plotter presents this bug [I used canvascell.plotter.Bar]. What plotter do
you use ?

cheers,
Gabi

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