Druid Bar is a movable mana bar that keeps track of your current mana, even in a shapeshifted form like bear or cat. remember that this addon is an estimation of your mana, and it could be slightly higher or lower depending on your level(Lower levels will have more problems since there is much less room for error with their smaller mana pools).
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If you've used previous(<3.0) versions of DruidBar...
My suggestion to you is this: Completely remove the previous version of DruidBar. Delete it. empty that trash can. Then load up the game once. Then, log out and install DruidBar 3.0. Log back in, and configure to your liking. Why should you do it this way? Well, a few of the Saved Variables stayed the same, but most changed. If you just added the new version, you'd have a ton of variables just junking you up. So might as well start from scratch, eh? Of course, you COULD just try adding it as is....who knows what trouble it could cause? mwuahahahahaha...AHAHAHAHAHAHA!
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To ModMakers:
Want to find a way to integrate DruidBar into your player frames? Easily done. first, check if druidbar is installed. do a simple if statement
if DruidBar_OnLoad then blabla end. note the lack of ()'s. you're checking if that function exists. if it does, druidbar is installed.
then, you simply need to know two variable names:
DruidBarKey.keepthemana
DruidBarKey.maxmana
keepthemana is for the person's current mana. maxmana is the max mana. can plug that data in anywhere, and you should be set!