I have this weird glitching happening in minecraft menus and in the in-game UI when I play. I have reinstalled the entire game several times and this seems to happen the same amount in vanilla as with addons and texture packs. I have the latest version of my graphics card driver and I have no virusses. This bug is only in minecraft, no other programs I use have this.
In the attached picture you can see the bottom UI displaying weird textures behind the tools and items.
Here are some more examples. The loading bar/experience bar has a weird texture here.