Warning: Error occurred while evaluating listener callback. (problem with parfor?)

I get the following error randomly sometimes after my MATLAB program hangs and I press ctrl-c. I'm not using any object oriented code myself, though I do use 3rd party libraries that might (they also use mex files if that matters).

It uses some fairly long-running loops and so is not very easy to test -- usually the problem does not occur; maybe if I knew a bit more about the message I could come up with a test case. Here is the error:

??? Warning: Error occurred while evaluating listener callback. > In dataToFluxFixMulti at 14 In yeastAnalysis at 163 In yeastResults at 37 ??? Error using ==> parallel_function at 598

Error in ==> dataToFluxFixMulti at 14 parfor i = 1:nReps

Error in ==> yeastAnalysis at 163 [v_fix, ~, v_fix_s, ~] = dataToFluxFixMulti( ...

Error in ==> yeastResults at 37

If it helps, here is the rather short function that has the parfor loop:

function [v_sol, lIter, v_sol_s, lIter_s] = ...
    dataToFluxFixMulti(m, r, r_sd, nReps)

% This is like dataToFlux, but returns a mean and std
% for v_sol and lIter, and saves the flux distributions.

nRxns = length(m.rxns);

v_sol_Dist   = zeros(nReps, nRxns);
lIter_Dist   = zeros(nReps, nRxns);

timeInit = num2str(now());

parfor i = 1:nReps
    [v_sol, lIter]    = dataToFluxFix(m, r, r_sd);
    v_sol_Dist(i, :)  = columnVector(v_sol)';
    lIter_Dist(i)     = lIter;
end

v_sol   = mean(v_sol_Dist)';
lIter   = mean(lIter_Dist);

v_sol_s   = std(v_sol_Dist)';
lIter_s   = std(lIter_Dist);

fileNameOut = ['dataToFlux_' num2str(nReps) '_' timeInit '.mat'];
save(fileNameOut, 'v_sol', 'v_sol_s', 'v_sol_Dist', ...
    'lIter', 'lIter_s', 'lIter_Dist');

[Benoit Pasquier]

I have a very similar issue but it does not happen randomly, but always...