This is a blog, not directly pointed at a Jebbed item, however it is something that he has yet to fix in the game.

The dreaded Shift Glitch is a bug in-game, where the game itself will seem to think that you are holding down your shift key on the keyboard. This will affect you in-game in a few ways.

Inventory:

If the shift glitch is occurring for you, and you are trying to get some things out of your inventory, into your hot-keys. Or put something into a furnace/chest/etc. It will not work. If you are using the creative inventory, trying to take something out, it will put a 64 stack of that item into your cursor, and you will not be able put those items down. If you are attempting to put something into a chest/furnace/etc, you will not be able to move them out of your bag, as every time you click them, they will just continue to switch from your inventory, to your hot-keys, and back to your inventory.

Chat:

The dreaded Shift Glitch will truly mess you up in Chat, if you tend to change slight grammar errors before pressing enter. If the Shift Glitch is currently being, well glitched, and you try using the back-arrow in a chat message before you press enter, it will highlight everything you go back over, as if you are holding down your mouse highlighting it. So if you go around halfway back into your message, and press N to replace R, it will replace Everything highlighted, with one, single, R.

The Point:

The point of this post is, well with Jeb continuing to add these insane updates to the game, changing nearly the entire aspect; how has he not had the time to even acknowledge these common, and annoying bugs?