Did you have Twonky running when you made this change? I can’t remember whether I changed the settings in Twonky first, and then changed the /etc/contentdir to reflect these changes. I’ve never had the contentdir file overwritten, except by firmware upgrade. It’s possible that stopping Twonky causing the contentdir file to be overwritten with the values from the Twonky UI.
What firmware are you running?
I don’t use cron to sort out the reboot mess with indexing, etc; I use the /CacheVolume/user-start file, because it’s the last thing called during the startup process.
