This issue is also happening to me. After the recent patch, I've thrown away 2 AKMs a SKS and a Mosin, not to mention a few magnums. Unbinding "throw" does not resolve the issue. This happening mid-fight with players or zombies is a complete kill-joy.

Out of all the bugs encountered in the standalone, this one is the most game breaking for me, I can deal with glitchy zombies and other development mountains. Throwing away weapons and items leaves a very poor taste.

O.P. states the problem effectively.

Hope this gets addressed and fixed soon.