Put the summary of the bug you're having here
What I expected to happen was...:
Everything would be fine
What actually happened was...:
Out of the blue, Everything was buggy. The home screen,items,Shift + left click,and Middle click
Steps to Reproduce:
1.It just happened, and has been going on for several days.
2. ...
3. ...
Environment
Put your operating system (Windows 7, Windows XP, OSX) and Java version if you know it here
Turn off touchscreen mode in video settings.