1. Install openSUSE 64bit from scratch
2. Install VirtualBox-qt with yast, install all recommended dependencies
3. Create a new Machine with an .iso - CD-ROM-File -> test Startup of VM -> VM
starts up.
4. Add an remote cifs mountpoint to your fstab which isn't online 
5. Reboot the Machine
6. Try to start the even working new VM -> VirtualBox reports that the startup
isn't possible because the kernel module is missing.

7. Remove the fstab Entry from 4. -> Reboot -> Restart VM, Works again.



My sample-Entry to fstab:
//192.168.0.1/dat   /server    cifs   
users,credentials=/etc/.pass-pw,gid=users,uid=jue 0 0 

The credentials-file was available (double-checked).

In my case the remote-share is inside of a VM, so the first mount during
startup will fail. Since the error appears the mount will never work because
the VM cannot come up. Same configuration on openSUSE 12.3 worked.