first:
unload ANY mods before you claim bugs to BI.

second:
solving your problem is very easy.
unload and delete the soundmod "Speed of Sound" from your arma3 installation.

development branch 1.47.131133 has same problem as stable,
certain cargo types stopped to work with slingload.

No mods running!!!

more info!?
use this test mission:
https://drive.google.com/open?id=0B1gWUNu0kwK1SjhQRi1vU1VYSmM&authuser=0
it simple does NOT WORK anymore and there are no errors in .RPTs concerning this problem!

after more testing found out there are certain cargo types which worked previous update 1.46
have now stopped to function with slingload.

test mission:
https://drive.google.com/file/d/0B1gWUNu0kwK1SjhQRi1vU1VYSmM/view?usp=sharing

all slingload cargo types from editor class objects (containers) stopped working!
NOTE they have all the "DLC Helicopters" Icon!

slingload cargo net from editor class ammo stopped working!
NOTE this too have the "DLC Helicopter" Icon!

the only editor class that still works are the slingload supports containers.
have also the "DLC Helicopter" Icon.

and slingload able vehicles seem to work too

made new test mission, has two mission markers named "cargo that still works"
and "cargo that stopped working".

start mission and you will see all cargo types at marker "cargo that stopped working" WONT work anymore!

https://drive.google.com/file/d/0B1gWUNu0kwK1SXNscWdhb2Z0SWc/view?usp=sharing

.RPT added in zip file

today's update fixed the issue !

thank you

switching back to stable ArmA3 Tools resolves issue

exact this behavior occurs too

example - end of RPT file

13:59:09 Initializing Steam server - Game Port: 2302, Steam Query Port: 2303

The next line, if successful would show (but doesn't, unless I remove the bikey causing the issue):

14:03:00 Connected to Steam servers

http://forums.bistudio.com/showthread.php?167618-RH-M4-M16-pack&p=2872496&viewfull=1#post2872496

http://forums.bistudio.com/showthread.php?167618-RH-M4-M16-pack&p=2873241&viewfull=1#post2873241

did test it myself, subscribed development branch ArmA3 Tools,
created test key, loaded it together with other keys,
then started server...

exact same behavior as described above in links

server shows never online

download this keys https://drive.google.com/folderview?id=0B1gWUNu0kwK1YldoLTMyTDl4eWc&usp=sharing start them together
server wont show online and each time you switch off server console you have to kill process manual.

"Q-Net_test.bikey" name of key made with development branch of Arma 3 Tools

it also happens when AI is driving the tank

http://forums.bistudio.com/showthread.php?188196-tanks-sinks-after-update

it also happens when AI is driving the tank

http://forums.bistudio.com/showthread.php?188196-tanks-sinks-after-update

bug sneaked in today's main branch 1.02.110424

problem still exists

tested again in new development build 1.03.110425

problem still exists.

hope this does not sneak into probably stable patch tomorrow !

link to forum thread:

http://forums.bistudio.com/showthread.php?165364-Binoculars-problem

since EXE rev. 110573 fixed