WowAce

What steps will reproduce the problem?
1. Play a hunter
2. Use addons; either spellflash or adibuttonauras gives the same error
3. Get "Lock and Load" to proc

What is the expected output? What do you see instead?
All works like it should combat-wise, just get an lua error

What version of the product are you using?
4.6.6

Do you have an error log of what happened?
6x [ADDON_ACTION_BLOCKED] AddOn 'SpellFlash' tried to call the protected function 'OverrideActionBarButton3:Show()'.
!BugGrabber\BugGrabber.lua:589: in function <!BugGrabber\BugGrabber.lua:589>
[C]: in function `Show'
FrameXML\ActionButton.lua:301: in function <FrameXML\ActionButton.lua:275>
[C]: in function `ActionButton_Update'
FrameXML\ActionButton.lua:577: in function `ActionButton_OnEvent'
FrameXML\ActionButton.lua:137: in function <FrameXML\ActionButton.lua:134>

Locals:

Please provide any additional information below.
Same error occurs and blames both Spellflash and Adibuttonauras for the same error, perhaps this has something to do with Bartender, the author of Adibutton auras says it is not from his addon.

There is not a single mention of Bartender in this error. What made you think its related to it? :)
From the names of those addons, you could point them to http://www.wowace.com/addons/libbuttonglow-1-0/ .. it sounds like it might be what they are looking for. ;)

Only because I'm getting the same error for two separate add-on's that both do similar things and they both affect the buttons on action bars your add-on allowed me to customize. Reported the error and was also told it was not in fact their add-on causing the error. Thought you might recognize part of the code as your own. Was worth a shot considering I know nothing of coding.

Looks like you and Adirelle, the author of Adibuttonauras, think alike https://github.com/Adirelle/AdiButtonAuras/issues/149#issuecomment-70362304

Thanks for Bartender4 btw; great work.

I had a quick peek at SpellFlash, and the code they use would cause this problem, no matter what they claim, i'm afraid.