/usr/bin/tr fails if the locale is set to UTF8, like:
$ env LC_ALL=en_US.UTF-8 echo TRUE | /usr/bin/tr [:upper:] [:lower:]
Bad string
while the usage of /usr/xpg4/bin/tr will work:
$ env LC_ALL=en_US.UTF-8 echo TRUE | /usr/xpg4/bin/tr [:upper:] [:lower:]
true
The sczbt_register file is using /usr/bin/tr and will fail if the root environment is setup with an UTF8 locale.