VM Hangs Following Change To Max memory

Hi,
Hoping someone can shed some light on this issue. I'm running OEL 5u5 x64 ( installed using OVM ) on Oracle VM 2.2. I've installed the OS with no bother. I've then powered off the VM, and increased the Max Memory setting. The VM will now no longer boot past the image loader.
Returning the Max Memory setting to it's original value, fixes everything. I've tested this on existing, and new VM's.
Any ideas?
Thanks
John

OK, fixed this issue. Found a solution in the release notes for Oracle VM Server 2.2.1 ( section 6.24 ).
However, does anyone know how to make changes to the vm's config file via OVM?

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