R help - Dec 2006 - Difference in outputs of random mixed effect models (lmer function)

Dear all,
       
      I  am using lme4 library (lmer function) for random mixed effect model. I 
came across different outputs using R versions 2.2.1 and 2.4.0. I am  not sure
whether it is due to new version of R or that of lme4 library.  I am looking
forward to know which version of R and lme4 library will  give me the correct
outputs.
        
      Best wishes,
      Syed M. Jamal
    Utrecht University
 		
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