[R-sig-ME] new version of lme4 - Log-Likelihood of model returned as "-Inf"

[juwb08 at hampshire.edu]

... the dataset failed to attach, so here it is.
Sorry!

Quoting juwb08 at hampshire.edu:

> Hi All,
>
> I was working with Poisson glmms in lme4 last year in 2013 using  
> Windows XP, lme4 version 0.999375-16 (2008-06-23) and R version  
> 2.15.1 (2012-06-22), evaluating a set of candidate models with AIC  
> to select the best ones.
>
> This worked well until I updated lme4 and R last month.
>
> I now updated to R version 3.0.2 (2013-09-25) -- "Frisbee Sailing"  
> and lme4 version 1.0-5 (2013-10-24), still Windows XP, and am  
> running the same models again on the same data, and lme4 now returns  
> "-Inf" for the log likelihood, so it can't calculate AIC.
>
> Using the previous versions, I got stable values for Log-Likelihoods  
> and calculated AICs with them.
>
> Attached is a sample of the dataset and the code I am using.
>
> How can I get a Log-Likelihood estimate with the current versions of  
> lme4 and R?
>
> Thanks in advance.
> Justin Baldwin
>
> Hampshire College, MA, USA