lme4 upgrade broke my old code?

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Hello, I'm trying to update a mer object (here called 
crossed.lmer3) created about 2 years ago using lmer of a version I 
don't remember. I'm now using lme4_1.1-7   Rcpp_0.11.5 Matrix_1.1-5
in R version 3.1.2 (2014-10-31) Platform: x86_64-redhat-linux-gnu
(64-bit). When I do stuff that worked before, I get errors. E.g.:

crossed.lmer3a <- update(crossed.lmer3, ~ . + cmclsach + 
crclsach)

Error: $ operator not defined for this S4 class

and summary() gives nothing interesting.

summary(crossed.lmer3)

Length  Class   Mode 1    mer     S4

Also, code from the examples from the lme4 manual also gives 
errors: str(terms(crossed.lmer3)) Error: $ operator not defined
for this S4 class

Enter a frame number, or 0 to exit

Can I get a little advice here, please?

I think that starting with version 1, lme4 was not compatible with the
lower version code.
I am afraid that you will have to calculate the old models again with
the newer lme4.

Cheers,

Marko



- -- 
Marko Ton?i?
Research Assistant
University of Rijeka
Faculty of Humanities and Social Sciences
Department of Psychology
Sveucilisna avenija 4, 51000 Rijeka, CROATIA
e-mail: mtoncic at ffri.hr
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