  Well I have finally had a crash, but I am not sure that it can be
entirely blamed on R.
  I reorganized my libraries to cut out overlap by putting all
functions (R, C, and Fortran) used by several libraries in a separate
library that is required by the four others. Some C code is called
directly by R functions in several libraries, and not just through an
R function interface. When I load a library, R does not complain
(although it now checks resolving functions in dynamic loading and
complains if there is a problem in other situations). But when I use a
function in one of my main libraries that requires a C function in the
utilities library, R promptly crashes saying that it cannot resolve
the function call. (Note that the same C function can be dynamically
loaded simultaneously in several libraries without conflict; I had
been doing this all along and have gone back to doing it.)
  By the way,
> seq(6,42,by=10)
[1] 6 16 26 36 46
> seq(7,42,by=10)
[1] 7 17 27 37
is not what the manual says it should do.
  Jim
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