A very annoying bug, which can break a whole mp session because the medics can't heal or get in a vehicle. Please fix this asap!
Older ticket: http://feedback.arma3.com/view.php?id=21906

Please close this ticket. :)

The problem persisted for a while and I stopped checking every dev update while we switched to playing on stable branch.
Because of this I have no idea when exactly it was fixed, but the latest dev versions 1.40.xxxxx seem to be unproblematic, at least in this regard. The server was idling over night without a crash.

Yes, same error with 1.37.128609, new crashdump attached.
Anything else I should try? Files we're validated, patched with SteamCMD, settings and mods don't make a difference.

Workaround from Dwarden: Replace the steam_api.dll with the old version from stable branch 1.34

Everything seems fine now.

Another smaller issue, maybe still related, popped up: It's not possible to pick up magazines and grenades from the uniform, vest or backpack of dead bodies. I have to drag them all to the ground first, before picking them up works.

I had the same problem, posted about it here: http://forums.bistudio.com/showthread.php?174430-Weird-sound-issue-with-Mi-48-Kajman-cannon&p=2642337

Since then I can't reproduce it anymore. I changed back to the old X-Fi Music and updated the Catalyst drivers to the new 14.4 beta, don't think anything else changed except Arma 3 patches of course. No idea what did it.

You'll have to lower the sample number under audio options significantly if you can't get rid of the problem.

You will find no card that does support hardware acceleration for Arma 3, Arma 1 was the last game to support this and only old games do with workaround ALchemy on Vista and later OS. There is only software based audio stuff anymore since years, maybe it changes with the new AMD TrueAudio in the future.

Try different drivers or your onboard sound chip, or live with lowered samples. I somehow got rid of it and now can't reproduce anymore on 2 PCs, second one with the Asus card.

Also happens when using Alt+Tab and switching back inside the game.

For a video see: http://forums.bistudio.com/showthread.php?152866-General-Discussion-%28dev-branch%29&p=2668113&viewfull=1#post2668113

I can confirm the fix, even if a bit late. Forgot about the ticket as I made a small addon for myself...

The same happens with the new DMS optic, added screenshots

I guess it is a problem with the damage texture of the fence, changes to black when shot on the small part near the ground.