ok, i searched the entire WoW folder for any MobHealth files or folders and i found this:
Why are you running both embedded AND disembedded libraries? Pick one or the other. You seem fairly inexperienced, so I would suggest sticking with the (default) embedded method. If you use WAU, make sure it's configured to "delete before extracting" and to download "with externals" (or uncheck "no externals"; it's been a very long time since I used WAU, so I don't recall the exact wording), and then use the "Reinstall all addons" function.
Yes, but that applies to any addon's saved settings, and has nothing to do with PitBull specifically. PitBull is unique (or at least uncommon) in that when you switch profiles, it fails to apply all of the settings, but during a normal "full load" (such as what happens when you log in or reload the UI) it does apply all of the settings.
Having an issue where bosses and unknown NPCs are classed as paladins. This seems to be the default unknown class. places where this is an issue like moroes, or HKM or Illidari Council.
not sure if this is a PitBull issue or DogTag.
Change your class DogTag to [IsPlayer ? Class ! Creature] to show class titles only for players, and creature types for non-players. Much more useful than seeing "Humanoid" on players and "Paladin" on mobs.
You'd have to create totally separate profiles and manually swap when joining a different-sized raid; this would mean keeping 3 or more profiles' layouts for player, target, party, and any other non-raid frames in sync with each other. i.e. if you changed the format of your target health text, you'd have to change it in the other 2 profiles too. Personally I'd recommend Grid for raid frames, for this and many other reasons.
As for your second question: it depends. If you're okay with having gaps between party frames when no party targets exist, you can certainly arrange your frames that way. Use the "square" layout for both the party and partytarget unit groups.
So nothing about the debuff timers showing up funny eh?
The problem with your problem is that in order for someone to be able to say why it happens, or how it can be resolved, that someone would have to be familiar with the inner workings of PitBull's code, and the author of PitBull (ckknight) hasn't addressed anything posted in this thread in many months. You could try posting a ticket on Jira (jira.wowace.com), as that is where the author has stated he prefers issues be posted, but personally I never had much luck with posting PitBull issues there either. Out of maybe 10 issues I posted there, only 2 ever got responses from anyone involved in PitBull development: one 6 months later asking if I still had the problem (I didn't), the other about a month later asking if I still had the problem (I wasn't even using PitBull anymore). Good luck. :P
"SharedMediaLib" (files.wowace.com/SharedMediaLib) is pretty ancient, and is only still in use by a few addons that haven't yet updated. Chances are you don't need it at all and can safely delete it.
"SharedMedia" (files.wowace.com/SharedMedia) is a collection of fonts, textures, and sounds that are registered with SurfaceLib, SharedMediaLib, LibSharedMedia-2.0, and LibSharedMedia-3.0 to be available in all addons that use one of those library versions. Note the lack of the word "Lib" in its name.
"SharedMedia-2.0" (also note no "Lib") is deprecated and no longer exists on the SVN (and therefore no longer on files.wowace.com or shown in WAU). It was an update of "SharedMedia" to register media with LibSharedMedia-2.0 instead of SharedMediaLib; but as "SharedMedia" now registers with all versions, "SharedMedia-2.0" is now redundant and unnecessary. Delete it, and migrate any custom media you'd added to it to "SharedMedia".
Well, I'm pretty sure those ARE PitBull raid frames, and yes, it would be very easy to make PitBull raid frames look like that. Hide the mana bar, use a class-colored name text anchored to the left of the health bar, use probably a custom health text anchored to the right of the health bar, and a custom text anchored to the right of the frame to show any buffs you want to track. Why don't you just spend some time playing with the PitBull configuration? The layout in that screenshot is very basic and shouldn't take much work at all to replicate. If you run into anything you can't figure out, ask.