Odd problem developed recently interactive flag, 'flickering'

[Linda Walsh]

I have a few  files run at login (could be one big file, bug
modularized by function)...

I did a 'sudo' and caught caught by this...

I hve a check to see if I am in an interactive session, if so
I do some more stuff than if I was being called in a shell file.

I turned on a debug line that prints $- at the enter/exit points of each 
subscript:
It put out:
entering /home/law/.bash_env ...
himBH
>> /etc/local/aliases.sh...
himBH
exiting /etc/local/aliases.sh...
himBH
entering /etc/local/bashrc.sh ...
himBH
entering /etc/local/profile.sh...
himBH
>> /etc/local/aliases.sh...
himBH
exiting /etc/local/aliases.sh...
himBH
entering /etc/local/vars.sh ...
himBH
entering /etc/local/common.sh...
himBH
hmuBH                      <<<<---- this one doesn't have the interactive bit 
set..
exiting /etc/local/common.sh...
himB
exiting /etc/local/profile.sh...
himB
exiting /etc/local/bashrc.sh ...
himB
---- set -o from before the one before to after that one:
entering /etc/local/vars.sh ...
himBH
>>>>>>/etc/local/common.sh#7> [[ -n '' ]]
>>>>>>/etc/local/common.sh#7> [[ -O /tmp/debug_local ]]
>>>>>>/etc/local/common.sh#8> echo 'entering /etc/local/common.sh...'
entering /etc/local/common.sh...
>>>>>>/etc/local/common.sh#9> [[ -O /tmp/debug_local ]]
>>>>>>/etc/local/common.sh#9> source /tmp/debug_local
>>>>>>>/tmp/debug_local#1> echo himxBH
himxBH
>>>>>>/etc/local/common.sh#11> typeset -xr _LOCAL_DIR_=/etc/local
>>>>>>/etc/local/common.sh#13> 
>>>>>>_local_common_nounset=braceexpand:emacs:hashall:histexpand:history:interactive-comments:monitor:xtrace
>>>>>>/etc/local/common.sh#14> set -o nounset
>>>>>>/etc/local/common.sh#16> alias 'PUB_CONST=typeset -xr'
>>>>>>/etc/local/common.sh#17> alias 'PUBLIC=typeset -x'
>>>>>>/etc/local/common.sh#18> shopt -s expand_aliases
>>>>>>/etc/local/common.sh#19> echo hmuxBH                 << interactive 'off' 
>>>>>>(why?)
hmuxBH
>>>>>>/etc/local/common.sh#20> set +x
exiting /etc/local/common.sh...

+++++ set +x
exiting /etc/local/common.sh...
--------------
In source, that corresponds to:
set -x
[[ -n ${DEBUG:-} || -O /tmp/debug_local ]] && {
        echo "entering $BASH_SOURCE..." >&2;
  [[ -O /tmp/debug_local ]] && source /tmp/debug_local ; }   ### the echo $_ was
put into here.

typeset -xr _LOCAL_DIR_=${_LOCAL_DIR_:="/etc/local"} 2>/dev/null

_local_common_nounset=${SHELLOPTS/*nounset*/nounset}
set -o nounset

alias PUB_CONST="typeset -xr"
alias PUBLIC="typeset -x"
shopt -s expand_aliases
echo ${-/i}
set +x
if [ -n "${_sh_interactive_shell:-}" ] ; then


So is there something between those lines that would turn off the interactive
switch ???  Or how could this happen?

Thanks!