ddd & bash or bashdb

I have been trying to use ddd to debug some bash scripts and every
time I run it, following are the results:

Using Ubuntu 8.04 LTS
DDD 3.3.11 (installed with apt-get)

bash --debugger backup.bsh   (works)
bashdb backup.bsh                 (works)

ddd backup.bsh  (bash could not be started)
ddd --bash backup.bsh (bash could not be started)
ddd --bash -debugger backup.bsh (bash could not be started)
ddd --interpreter='bashdb' backup.bsh (bash could not be started)
ddd --interpreter='bash -debugger' backup.bsh (bash could not be started)

ddd --bash -debugger  seems to work, there is an hourglass, and
blinking green square in the lower right. I can do file open source
and load my program, but nothing works. When I try to close - it says
bash is still busy - do I want to kill it.

It seems to work fine for Perl, and all the documentation I have been
able to locate suggest that this is the way to call ddd for bash. I
also searched the archive mailing list and found nothing suggesting
others were experiencing this, or a solution.

I was going to look into see if I needed to get the latest
3.3.12-test6 but have never complied on my computer and did not think
was the application to be experimenting with that task.

Any assistance with this matter is greatly appreciated.

David Anderson.