WowAce

What steps will reproduce the problem?
1. Join a group
2. Go into an instance
3. Hit something

What is the expected output? What do you see instead?
no errors, but got the "an addon has caused an interface error" message

What version of the product are you using?
r29

Do you have an error log of what happened?
log produced by WoW contains lots of the following messages repeated:

6/24 18:58:31.259  An action was blocked in combat because of taint from Langoustine - LTHUnitButton1:Hide()
6/24 18:58:31.259      Interface\AddOns\Langoustine\TankFrames.lua:201 OnUpdate()
6/24 18:58:31.259      Interface\AddOns\Langoustine\TankFrames.lua:152
6/24 18:58:31.259  An action was blocked in combat because of taint from Langoustine - LTHUnitButton1:Hide()
6/24 18:58:31.259      Interface\AddOns\Langoustine\TankFrames.lua:185 UpdateTankFrame()
6/24 18:58:31.259      Interface\AddOns\Langoustine\TankFrames.lua:203 OnUpdate()
6/24 18:58:31.259      Interface\AddOns\Langoustine\TankFrames.lua:152
6/24 18:58:31.259  An action was blocked in combat because of taint from Langoustine - LTHUnitButton1Target:Hide()
6/24 18:58:31.259      Interface\AddOns\Langoustine\TankFrames.lua:185 UpdateTankFrame()
6/24 18:58:31.259      Interface\AddOns\Langoustine\TankFrames.lua:206 OnUpdate()
6/24 18:58:31.259      Interface\AddOns\Langoustine\TankFrames.lua:152

over 1 Gundrak run the taint.log was over 3MB in size

Please provide any additional information below.

enGB client on live servers 3.1.2 patch

Further info for this ticket, I tried loading Langoustine as the only addon and it fell over due to AceEvent not being loaded. Checking the embeds.xml you are not loading this library.

I modified the .xml and .toc to get Langoustine to load correctly, and still get the taint errors listed in the ticket when no other addons are loaded.

i fixed the embeds to mark AceEvent 3.0

and added a check for combat lockdown in the update. show no longer taint.

With R34 on enGB client, live servers there is still taint:

7/1 01:40:56.878  An action was blocked in combat because of taint from Langoustine - LTHUnitButton1:Hide()
7/1 01:40:56.878      Interface\AddOns\Langoustine\TankFrames.lua:205 OnUpdate()
7/1 01:40:56.878      Interface\AddOns\Langoustine\TankFrames.lua:155

only addons loaded were Langoustine and LangoustineOptions, and there were no library errors, so that part is fixed at least.