When I am using impress to view power points, after a little while (time is variable) it turns my screen black and returns me to the login screen of my system. The only way I am able to replicate the issue is having LibreOffice open while viewing a powerpoint. If it helps any, I am viewing a power point on my google drive via Astrada’s Google Drive package.
Arch Linux kernel: 3.11.5-1-ARCH
LibreOffice: 4.1.2.3 build 2