BASH 3.0, IRIX, and INTR?

[si]

Hello,
        I recently upgrade from bash 2.05b to 3.0, and noticed that for some
odd reason that INTR requests (^C) are no longer functional.  In most instances
it seems that ^Z also does not function.  Has there been any change in this
behavior between these versions?  Is this possibly a portability issue with
IRIX 6.5?  stty is showing the terminal configured properly, but simple tests
like a ls -lR / can not be interrupted with a ^C or backgrounded with a ^Z.
The same environment with bash 2.05b continues to function.  Any advice?

Thanks,

John Farnsworth