Regardless if I'm on Singleplayer or Multiplayer, I get one of two issues.
1) I'll just be walking around or building when all of a sudden my character walks forward without me even having my fingers on the keys. The only way to get out of this is to either go into the inventory or the pause screen.
2)At random times, with no way that I know of to trigger it, I can't freely move items around in my inventory. It stays stuck on instant shift clicking.
Fyi this has happened to me since 1.4 came out, including the pre-release.
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Duplicate of MC-886 , please use the search function to see if your bug has already been submitted. Currently over 35% of tickets are being closed as duplicate.

I couldn't find the same issue when I searched before, and it's slightly different. Whatever the case, I hope these problems are fixed soon. 🙂
Please do not mark issues as private, unless your bug report is a security issue containing information that may compromise your server/client.