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A general description is here.
The functions ‘.C()’, ‘.Call()’, ‘.External()’ and ‘.Fortran()’ now check that they are called with an unnamed first argument: the formal arguemnts were changed from ‘name=’ to ‘.NAME=’ in R 2.13.0, but some packages were still using the old name.
‘Sweave()’ by default now reports the locations in the source file(s) of each chunk.
A foreign function call (‘.C()’ etc) in a package without a ‘PACKAGE’ argument will only look in the first DLL specified in the ‘NAMESPACE’ file of the package rather than searching all loaded DLLs. A few packages need ‘PACKAGE’ arguments added.