I've VirtualBox 5.0.10, host system is Windows 7 professional 64 bit and guest system is Debian GNU/Linux 8 (jessie) 64 bit. The guest system is correctly installed. The problem: at the starting, I do login and kde starts. After that sometimes it's all ok, other times Debian is entirely blocked: no mouse and keyboard input, nothing... In this situation the only solution is open task manager in windows (host system) and kill virtual box window.
Any ideas?
Thank you!
(sorry for my english