aggregate() problem on last patched version

Hi R users and developers:

Several hours ago I post a problem with the aggregate() function
using the last patch version of R.
(R version 2.8.1 Patched (2009-03-18 r48193))

I do compile again the 2.8.1 plain version (not patched) and
now it works again, both the examples and  my old scripts that
use this function.

What are the changes on the patched version that produces this
behavior on this particular function?

Thank you for your attention.

Kenneth