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[[BiA]FRAGMAN]

I've just discovered a quite serious bug, that can render UnleashX unbootable, and therefore the Xbox, if you use UnleashX as default dashboard.
If you have UnleashX scan through a directory for titles, it will crash if a default.xbe file is corrupt or with a filesize of 0. It occurs with next reboot after updating items.xml, and there is only one way of saving the Xbox, and that is using a boot CD/DVD, so you can delete items.xml, making the Xbox bootable again.

Not knowing the structure of UnleashX, I can only suggest a possible solution would be an exception system, also catching infinite loops, as my guess is what happens here.

Provoking the error (Warning, do not try this unless you know how to recover your Xbox from an unbootable state):
Include this text inside the <Menu> tag in config.xml
"<List Text="TEST" Auto="Off" Sort="On" DelayLoad="False">
<Path>E:\TEST</Path>
</List>"
Place a file in "E:\TEST" called "default.xbe" with a filesize of zero.
Reboot Xbox twice, and UnleashX will either freeze or restart indefinetely, regardless of version-number.