I couldn't find a thread discussing this already, so forgive me if I've missed something.

I am currently using an MM spec for PVE and shortly after getting hold of the Glyph of Steady Shot I was disappointed to note that for some reason it wasn't working as expected for me. On a whim, I respecced 51/20 BM and found the glyph to work, so something about the MM talents was causing it to fail. A lot more testing was needed, so here is what I tried and the results I had, these should be reproducible in-game with the same setup I used.

Using a vendor-bought Fine Light Crossbow (fixed damage range) and shooting the Ironforge heroic target dummy with no other gear on. For each test, I tried each time with/without hunter's mark on the target, and later in the tree with/without TSA as well.

Test #1 - zero talent points spent
No serpent sting: steady shot damage is fixed between shots.
With serpent sting: steady shot damage increases ~10%

Test #2 - talented down to 3/3 Improved Stings (http://www.wowhead.com/?talent=cZceAbRh)
No serpent sting: steady shot damage is fixed between shots.
With serpent sting: steady shot damage increases ~10%

Test #3 - talented down to just below Marked for Death (http://www.wowhead.com/?talent=cZceAbRhzMeoxuh)
No serpent sting: steady shot damage is fixed between shots.
With serpent sting: steady shot damage increases ~10%

Test #4 - talented down to just below Chimera Shot (http://www.wowhead.com/?talent=cZceAbRhzMeoxuA)
No serpent sting: steady shot damage is fixed between shots.
With serpent sting: steady shot damage does not increase!

Test #5 - talented up to full 7/57/7 spec again (http://www.wowhead.com/?talent=cxbZceAbRhzMeoxuAox00b)
No serpent sting: steady shot damage is fixed between shots.
With serpent sting: steady shot damage does not increase!

My conclusion is then that something about the MM talent Marked for Death causes the glyph effect to stop working.

Can anybody reproduce my results and confirm what I am seeing? Is the talent + glyph combination indeed bugged? If so then this is a fairly substantial nerf in damage for Marksmen hunters, and I hope it is indeed a bug that can be fixed by Blizzard.

Solid find

hmm,

I will be testing this tonight, i was planning on tweaking my spec a little and before i talent chimera ill go and hit the dummies in IF first.

Will be verry sucky if it is broken.

Dont tell me its true... :-(((
We are broken, more then broken draeneis... :-(((

This is a very useful find Kornski, thanks so much for the investigation.

I always thought that that Marked for Death talent was underwhelming considering how high up in the tree it is. Going to try and spec around it :)

Cheers m8, I wasn't planning to go MM any time soon, but I'll be sure to spread this knowledge to the Hunters in my guild.

You should post your findings on the Elitist Jerks Hunter forum, would be appreciated I think.

Thanks, you deserve 1g from every hunter on your realm to cover your costs. :)

Nice find.
Pretty important for a MM-lover like myself...
Not that I'm surprised to hear of yet another hunter related bug, sooo many of those floating around.

I was talking to a GM about my steady shot glyph, and I can tell you this:
The first thing he asked me is if I had the talent Marked for Death

So they apparently know about this bug

So how to handle with this information if will expect, that its true?
1. dont use the glyph until next patch
or
2. dont talent MfD
?

thanks for posting about this, Going to switch that glyph on my mm hunter now.

Swapping glyph till they fix it, sigh...

Thanks for the finding.

Please check and confirm before changing anything :)

I just did some basic testing on target dummies with and without Serpent Sting (with Steady Shot glyph ofc.) and there was no Steady Shot damage difference.
Myth Confirmed! :/

+1
Have this problem
T6 bonus gives huge buff and glyph gives nothing.doesn matter with or without T6 equipped
5\5 Marked for Death

o for @#*% sake i planned to play mm for a while but if actually wana show i care about my performance ill have to spec BM... 10% steady shot dmg is smt you cant really miss

bah i really didnt wanna go BM but it looks like im going to anyway

Now I know why I thought that t6 4-set bonus and glyph of steady shot didn't stack back when I was MM. =|

Great find! I noticed that the Glyph of Steady Shot wasn't working for me either, but I wasn't sure about the cause. I thought it conflicted with either the Improved Stings talent or the Glyph of Serpent Sting. Now we know it's Marked for Death. Thanks for clearing that up.

And yes, I really hope this will get fixed soon, since Steady is more than 40% of my damage.