lme4a crash

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Dear mixed modelers,

I am running r 2.13 and have installed lme4a.  When I try my nlmer model (that works in lme4) r crashes.

I am running mac osx 10.6.7

Any ideas?

More details (especially including a reproducible example) would be
very helpful ... see e.g. https://gist.github.com/270442

  ... Ben Bolker
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