What is your Race, Class and Level?
Night Elf, Druid, 80

What action bar mod do you use, if any?
Bartender 4 - 4.3.2

What is the expected output? What do you see instead?
I haven't noticed anything not showing, except "Swipe (Cat)"

What version of DrDamage are you using?
r735

Do you have an error log of what happened?
Interface\AddOns\DrDamage\Melee.lua:1419 attempt to concatenate field 'AP' (a nil value)
Count: 1

Call Stack:
(tail call): ?
[C]: ?
Interface\AddOns\DrDamage\Melee.lua:1419 in function `MeleeTooltip'
Interface\AddOns\DrDamage\DrDamage.lua:1231 in function <Interface\AddOns\DrDamage\DrDamage.lua:1206
(tail call): ?
Interface\AddOns\Bartender4\ActionButton.lua:467 in function `SetTooltip'
Interface\AddOns\Bartender4\ActionButton.lua:201 in function <Interface\AddOns\Bartender4\ActionButton.lua:199

Please provide any additional information below.
Here's my talent build including glyphs:
http://www.wowhead.com/?talent#0ZEGMsfrb0eR0huAkbA0z:cVm0VM