Cant put stuff in chests/furnace etc

[Christley]

Title: Cant put stuff in chests/furnace etc

Version: 3.1.2

OS: windows 7

Java Version: jre7u7

Description of Problem:

sometimes when i just gonna put some stuff in chests, furnace or crafting table, the are instantly dropped. another person on my server has that problem too. we have to restart the game for it to work again. i dont know how its made or what triggers it. but it happens.

another dude on my server running same setup as me, doesnt get this problem

Error Messages:

Error Log:

[thedeadone96]

the most likely issue is that your alt key is stuck, try tapping it a little bit and see if that helps the problem. alt isthe default key for convenient inventory to drop stuff.