Created attachment 736573 [details] screenshot 1 Opening a VirtualBox .VDI file / image fails. See attached screen shots.
Created attachment 736574 [details] screenshot 2
Created attachment 736575 [details] screenshot 3
Created attachment 736576 [details] screenshot 4
Created attachment 736577 [details] screenshot 5 - the most important screenshot
Created attachment 736578 [details] see the last portion of the log file
The problem is that virt-manager doesn't detect the VDI format properly. This can be seen from the log output where the machine is being generated with: <driver name='qemu' type='raw'/> You can workaround this with clicking "Customize configuration before install" and select "VDI" as a format of the disk image. The support for probing VDI files is not yet implemented, though.
given that a workaround is present for this problem, I have set the priority to "Medium".
Do not just reassign this bug to RHEL. For one thing I don't think VDI support is even compiled into RHEL6. If you are a RHEL customer and want to report an issue, please go through the appropriate support channels.
There is the same problem with qcow2 disk. The same workaround is working.
Upstream now will always use libvirt's storage APIs to detect an images format