I found a bug, or should I say a compatibility issue with certain .xex files:
Due to the fact that we may add applications to x:\applications\appname\default.xex
XeXMenu will always scan, build game lists cache and extract info from the .xex file; but what happens with .xex files like Autospeed.xex (for fan speeds, patch or not) ?
XeXMenu will freeze, lock up your 360 and sometimes throw off E71.
Power off and back on and it's all good.
Just sharing a finding.
Cheers.