Hey all. So for a while, Rawr.Cat has found the best rotation to include Mangle only for combo points, not shred, for most ferals, with either 2T6 or Imp Mangle. That has disagreed with theorycraft from other major sources (Toskk's for example). I didn't find anything myself to explain the difference, and I asked Toskk and others to check Rawr's calculations to see if they found anything. Well, they did; I forgot the Mangle multiplier on Shred. Silly mistake, I'm beating myself up for missing something so obvious, but that's what it is. So, until we get a new version out, here's how you can adjust the calculations for yourself. There are two ways to do it. If you're not sure which you want, use Option A.
Option A (if you haven't modified Rawr's buff cache)
Close Rawr, download this new BuffCache.xml file:
http://dl-client.getdropbox.com/u/38028/BuffCache.xml
Place it in the Rawr/Data/ folder, and relaunch Rawr. There'll now be a new buff, "30% Shred Damage (fix for 2.1.3 bug)". Check that buff, and you'll be good to go.
Option B (if you have modified Rawr's buff cache, and want to preserve your changes)
Close Rawr, open your BuffCache.xml file in a text editor, and add this additional buff (right after the 2nd line of the file, "<ArrayOfBuff...etc"):
<Buff>
<Name>30% Shred Damage (fix for 2.1.3 bug)</Name>
<Group>Shred Damage Fix</Group>
<Stats>
<Stamina>0.01</Stamina>
<BonusShredDamageMultiplier>0.3</BonusShredDamageMultiplier>
</Stats>
<SetThreshold>0</SetThreshold>
<Improvements />
<IsCustom>true</IsCustom>
<ConflictingBuffs>
<string>Shred Damage Fix</string>
</ConflictingBuffs>
</Buff>
Relaunch Rawr, and check the new buff. Your calculations should now be correct.
Again, sorry that a wrong calculation like this made it to release.