Why This Infinite Loop??

[beno]

Hi;
I successfully rebuilt FreeBSD from 5.3 to 6.1. However, when I ran
portmanager -u
my server went into an infinite loop! It kept reinstalling Bind and I 
think Perl. I don't think it installed anything more than that. I had 
run this command:
make delete-old-libs
but also had added the lib diff file between 5 and 6 (forget its name) 
so I had most of my lib files that I needed, and everything seems to be 
running okay. Then again, maybe I've missed something.

Why did this command create an infinite loop (that lasted 6 hours before 
I killed it)? Is there a better program/command I should use? How do I 
d/l that program?
TIA,
beno