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hope this can help
take a look at

http://mythtv.org/docs/mythtv-HOWTO-23.html#ss23.5

pay attantion that the -pmythtv means -p<myth password> with no space.
you can find the pswd in the Myth tv settings

had this same freeze problem with another 945 MB .
the only solution I found was to disable the LMCE screen saver (don't know whay ?).
in LMCE admin page go to media director page and press the Edit button near the software module.
you will get a new window , uncheck the screen saver and reboot .
you can add some background picture instead of the screen saver.