VBoxManage: Segfault on Linux host

[cendaaro]

After starting a machine with an attached immutable drive, I'm having some issues unregistering the machine once it has shut down. Trying to detach the storage (using storageattach with '--media none') results in the following:

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VBoxManage: error: The object functionality is limited
VBoxManage: error: Details: code E_ACCESSDENIED (0x80070005), component Machine, interface IMachine, callee nsISupports
Context: "LockMachine(a->session, LockType_Shared)" at line 251 of file VBoxManageStorageController.cpp
Error performing VirtualBox management operation (VBoxManage returned 1)

Simply unregistering the machine without detaching the drives first seems to work, however unregistering the machine with the '--delete' flag gives:

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VBoxManage: error: The object is not ready
VBoxManage: error: Details: code E_ACCESSDENIED (0x80070005), component Machine, interface IMachine, callee nsISupports
Context: "Delete(ComSafeArrayAsInParam(aMedia), pProgress.asOutParam())" at line 167 of file VBoxManageMisc.cpp
Segmentation fault (core dumped)

The sequence of commands used to do this worked fine under VirtualBox 3.x, but not 4.0.

Any ideas?