monline

If you've a running VM (Windows XP in my example) and you want to attach an ISO image as the virtual CD/DVD drive to this VM, VirtualBox brings up the Virtual Media Manager. However if you've an ISO image in the "CD/DVD Images" list that you've deleted previously, then VirtualBox hangs. Not just the Virtual Media Manager, but the respective VM too. Apparently it tries to access the missing ISO image file in an infinite loop. So take care not to delete any ISO images "manually" (in Finder) that are already added to the Virtual Media Manager "CD/DVD Images" list. Remove the image first from VirtualBox and only after that from your disk (Virtual Media Manager does not cause any problem with missing ISOs if it's not invoked from a VM's "Devices / CD/DVD Devices / More CD/DVD Images" menu).