if you have problems in completing the configuration of easy-debian-chroot 0.9.10, be aware that the postinst script aborts with error if finds /sbin/dmlosetup and in trying to change the ownership of /home/user/.config/autostart/qstart.desktop - both from a previous installation.
Only one million something bytes saved :-)
EDIT 2: problem: the MicroB browser window appears empty, with no widgets and doesn't react to ctrl-something commands, and it opens a supplementary window saying (in Italian) something like "updating".
... that usually happens when the browser daemon is not running in the background. Qole's scripts might be stopping that when you switch over to LXDE??
Did you do anything about Mplayer??? Currently watching Mplayer in Debian doesn't stop the screen DIM timeout.. so you have to keep clicking crap to keep the screen lit.