Same problem here.
In addition, everything is extremely slow.
I'm running ADE 4.0.3 on Mac OS 10.10.2.
Fixed the problem (on Windows). It was with the Intel 4600 HD graphics driver version. Updated to the latest version and it now works.
Alas, that can't be the cause of the problem in the OS X.
The driver update was fixed the page not turn problem on my hp 8470p laptop (win7 x64). Thank you.