if you take a look at my DecursiveRecount plugin you will see in the ADDON_LOADED section of the event function that I have added a section that turns off the built in Recount plugin. Hopefully the Vuhdo plugin has a similar block of code that you can locate the appropriate place to add this block of code to.
Code:
-- Disable the built in Recount plugin
if ( nUI_InfoPanels[nUI_INFOPANEL_RECOUNT] ) then
nUI_InfoPanels[nUI_INFOPANEL_RECOUNT].enabled = false;
end