Anomalous results with glmer().

Thanks Ben.  I now feel that there is hope! :-)

<SNIP>

   As for explaining the 'crazy' result, if it actually turns out to be
(close to) the MLE for this data set: I would look at pictures of the
data, predictions, etc., and try to see if there's some sort of
confounder/Simpson's paradox thing going on here where the marginal
effect (= raw tabulation) is in fact very different from the conditional
effect ...

I have tried to think of ways, like Simpson's paradox, to explain the 
anomaly, but nothing sensible comes to me.  If anyone can point me in 
the right direction .....

And is it not weird that the old version gives an intuitively plausible
estimate for the Mclus coefficient whereas the new version doesn't?

cheers,

Rolf