PERL Interface - upgrade from 6.2.1 to 6.3.2

Hmmm.. It's seems like my perl scripts now barf now that I upgraded the
server, at least when I run them on the server..(Haven't checked the
client machines yet)
I would assume that it has something to do with new lib installed during
upgrade.
Does anyone know if there is anything (diff's that I will find in the
new perl interface calls from the older versions)  that will break my
client CGI' s that are still using old 6.2.1 lib? Will I have to upgrade
all the clients also?