I am running VirtualBox on two different Macbook portables.
What OS's have you installed and are having a problem with ?
How much memory have you assigned to the VM's ?
The problem I run into the most is when I have assigned less memory than what the OS ends up needing.
I also found, in one case, that I had to enable 3D Acceleration.
Hi, to solve this problem, you must be in an administrator account, then you will need to download the .dmg file from VirtualBox, then open the dmg and you should see something like this.