Hi Ken,
Not sure if this helps, but I have seen some other problems with
using Matrix_0.9996875-0 (vs. Matrix_0.999375-50) in both R2.13 and
R2.14.
As shown in attached concatenated sessionInfo(), the example works
fine in 64 & 32 bit, but with Matrix_0.9996875-0 I can't load lme4a
in R2.13.
I've also seen issues with that version of Matrix in profiling.
I usually don't install 32 bit versions of packages anymore, so I
had to reinstall minqa & Matrix to install 32-bit versions, but I
don't think that has influenced this result.
Regards,
Rob