WowAce

Well that makes sense. You aren't using the latest release, the line numbers don't match compared to the release version. That issue was present in some of the earlier beta releases of 1.6.7 and has since been fixed.

Update to the latest version. When in doubt make sure you're using a release version and not a beta.

1.6.7 released:

- General:
- Improved tooltip handling for spells with AP and SP coefficients
- Improved hybrid class AP calculation handling
- Separated the coefficients line into two lines, making it hopefully less confusing
- Added armor based mitigation. Bosses have a known value (needs to be enabled in the options), for the rest you can now manually set mob armor to a value
- Added armor Penetration effects and buffs/debuffs
- Added Expertise, Dodge, Parry, and Glancing Blows (everything needs to be enabled separately if you want it to be taken into account)
- Added option for crit depression to melee module (-4.8% for bosses)
- Added 1s delay to UNIT_INVENTORY_CHANGED to make sure weapon buffs have had a chance to apply/disappear so they update properly
- Added wretching bile and shadow crash debuffs
- Added update triggers for health changes for the abilities effected (molten fury, death's embrace, drain soul, rend, victory rush, glyph of rejuvenation, earthliving weapon, prey on the weak, dirty deeds, merciless combat, test of faith, improved flash heal, glyph of sw:d)
- Added option for selecting between one/two roll hit calculation in melee module
- Fixed an error in Caster.lua related to using custom calculation variables
- Fixed error in dual-wield hit calculation
- Fixed target buff/debuff updates in some foreign locales

- Localization:
- Nuked all old localization tables cause it was incomplete and contained outdated keys
- Localization phrases are now automatically added from the wowace/curseforge localization application, if you feel you want the addon translated into your locale log on to wowace and assist in the translation process!

- Paladin
- Changed Holy Shield AP coefficient to 7.28% per charge
- Two-Handed Weapon specialization seems to double stack on the weapon damage portion, at least on paladin but I'll assume it does so on warrior and death knight as well. Someone tell me if it doesn't!
- Added stun effects for judgement of command
- Fixed damage modifiers to apply correctly to righteous vengeance

- Death Knight
- Removed +10 SP line from DK tooltips
- Unholy presence GCD reduction effects to caster module
- Death & Decay AP bonus seems closer to 0.048 than the 0.0475 generally reported
- Added Death Pact actionbar heal display
- Fixed Hysteria and Bloody Vengeance incorrectly increasing the blood plague portion of plague strike

- Rogue:
- Poison detection for mutilate should now work in all locales
- Added Rogue Poisons
- Fixed an error with Rogue mace specialization

- Priest:
- Penance can crit

- Druid:
- Predatory instincts now correctly applies to auto-attack in cat form

- Mage
- Added more stuns for glyph of fire blast
- Torment of the weak now triggers an update on more debuffs

- Hunter
- Fixed damage modifiers to apply correctly to piercing shots

I just tried creating a new priest and it worked, also tried on a higher level priest and it worked fine.

First of all what version are you using? If it's not the latest try upgrading and then see if it works.

Usually it's best trying first with the latest release (in this case 1.6.6). If that doesn't work try the latest beta (1.6.7_beta-9).

And this was with latest beta? Hmm...

One-handed weapon spec does matter as it's more damage.

Well, without more information I can't really connect that to anything DrDamage is doing. Every class uses the same calculation engine as well, so the only thing different is the shaman module but it doesn't contain anything special. Maybe it was just your computer acting up or possibly some other addon?

Does it happen regularly? What spells does it happen on? You can try disabling addons until you find what's causing the problem. Start for example by disabling half of your addons, if the problem is fixed then re-enable the half (and disable the other half) and disable half of them etc. Disable addons until you've figured which one is causing it.

1.6.7_beta-3
- Fixed error in Rogue.lua
- Fixed error in Melee.lua related to glancing blow
- Penance can crit
- Predatory instincts now correctly applies to auto-attack in cat form
- Nuked all old localization tables cause it was incomplete and contained outdated keys, added missing localization keys and changed others
- Added more stuns for glyph of fire blast, added stun effects for judgement of command, torment of the weak now updates on more debuffs
- Added option for selecting between one/two roll hit calculation in melee module
- Added Unavoidable property to melee type abilities that can't be dodged or parried


NOTE: Due to the localization changes all foreign translations have been deleted for now. I've opened the localization option in wowace/curseforge for anyone willing to help with translating files.

You need to activate mitigationcalc (target mitigation calculation, right next to the target armor option) before armor is taken into account.

Post the error message please. I can't seem to find anything wrong :)