Simulink: Accelerator handles parameter change from script, but Rapid Accelerator fails to rebuild

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I read the answer to "What makes Rapid Accelerator regenerate code?" which is related to my problem, but I'm still confused.

I want to benchmark Accelerator and Rapid Accelerator to see which makes more sense with a given model, but I discovered that I cannot use Rapid Accelerator unless I delete the slprj directory and the _acc.mexw32 file. If I don't do this, my model does not absorb changes made to parameters through a script. Normal and Accelerator modes work fine.

I'm using 2011a and to recreate my problem using a simple model, I show the effect on changing a decimation parameter D on a To Workspace block. If the parameter is changed from 2 to 3, it should print a different sequence to the screen. It fails under Rapid Accelerator. I tried setting Rebuild to Always (under Configuration Parameters > Model Referencing), but I get the same result.

Am I doing something wrong?

Here is what I did:

Connect a Counter Limited block (Upper limit = 10, Sample time = 1) to a To Workspace block (changing only the Decimation option - use D which is set in the script).

Simulation > Configuration Parameters > Change Solver to discrete

Name the model accel_test.mdl, and close it (or leave it open - the result is the same)

Matlab script which runs the model:

%%accel_test_run1.m
% This script recreates an issue where changing a parameter in this script and then using
% Rapid Accelerator gives an incorrect result.  Normal and Accelerator modes work as
% expected
% Dara Parsavand 2011-08-01
%%Initialize
clear, clc
modelname = 'accel_test';
%%Loop over cases
for sim_flag = 1:4
  % sim_flag definitions
  % 0 = don't sim (just assign parameters)
  % 1 = normal
  % 2 = accelerator 
  % 3 = rapid accelerator 
  % 4 = delete files + rapid accelerator   
    for D = 2:3
      fprintf('\nUsing sim_flag = %d, D = %d\n',sim_flag,D)
      tic
      %%Compile and Sim Model
      load_system(modelname)
      switch sim_flag
        case 1 % Normal
          set_param(modelname, 'simulationmode', 'normal')
        case 2 % Accelerator
          set_param(modelname, 'simulationmode', 'accelerator')      
        case 3 % Rapid Accelerator
          set_param(modelname, 'simulationmode', 'rapid')
        case 4 % Delete Files + Rapid Accelerator
          % Delete files 
          [stat, mess, id] = rmdir('slprj','s');
          delete([modelname '_acc.mexw32']);
          % Build and Simulate Model
          accelbuild(modelname)
          set_param(modelname, 'simulationmode', 'rapid') 
      end
      % cs1 = Simulink.BlockDiagram.getChecksum(modelname) 
      sim(modelname);
      fprintf('Simulation completed in %0.2f sec\n', toc)
      %%Print Results
      simout.signals.values
    end
  end