I'm using the latest version of pitbull(v4.0.0-beta40) and shields(v50001-1.3), and when I click to enable it under bars, I get the following LUA error, and the shields bar won't show up, and neither will the text using your instructions.

None of this happens for any other bars, and it doesn't happen (obviously) if shields is disabled.

Message: ...erface\AddOns\PitBull4\Options\LayoutEditor\Bars.lua:575: attempt to index a nil value
Time: 10/18/12 14:29:08
Count: 3
Stack: (tail call): ?
...erface\AddOns\PitBull4\Options\LayoutEditor\Bars.lua:575: in function member' ...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:249: in function <...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:197> ...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:1145: in function <...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:1055> ...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:1082: in function <...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:1055> ...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:1588: in functionFeedGroup'
...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:1513: in function <...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:1493>
(tail call): ?

[string "safecall Dispatcher[3]"]:9: in function <[string "safecall Dispatcher[3]"]:5>
(tail call): ?
...ace\AddOns\AutoVendor\libs\AceGUI-3.0\AceGUI-3.0.lua:314: in function Fire' ... ...ibs\AceGUI-3.0\widgets\AceGUIContainer-TreeGroup.lua:526: in functionSelectByValue'
...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:1684: in function FeedGroup' ...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:1860: in functionOpen'
...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:831: in function <...nfig-3.0\AceConfigDialog-3.0\AceConfigDialog-3.0.lua:614>
(tail call): ?

[string "safecall Dispatcher[3]"]:9: in function <[string "safecall Dispatcher[3]"]:5>
(tail call): ?
...ace\AddOns\AutoVendor\libs\AceGUI-3.0\AceGUI-3.0.lua:314: in function `Fire'
...or\libs\AceGUI-3.0\widgets\AceGUIWidget-CheckBox.lua:68: in function <...or\libs\AceGUI-3.0\widgets\AceGUIWidget-CheckBox.lua:57>

Locals:

Are you still seeing this?