Dear SPM List I have 10 models and I estimated the parameters using spm_dcm_estimate from the previous version (not from the 4667 update). All the estimated parameters were close to the actual values of the parameters When I used the same models after applying the 4667 update I got weird estimated values for 5 models. 2 of the models did not converge and 3 of the models converged very late. What is reason for this happening and if this happens should I use the 4667 update or go back to the previous version from April 2011. Thank you Mobin