What developer are you using, and at what temperature?
It is true that 10 years ago Kodak changed the films, how they are named and the recommended times.
Here is the older technical information sheet, with the prominent Discontinuance Notice: http://wwwcaen.kodak.com/global/en/p...bs/f32/f32.pdf
EDIT: The name change was from the old: Kodak T-Max 100 Professional Film to the new: Kodak Professional T-Max 100 Film
The labelling changed at the same time, including adding a warning about new times on the packages.