OK, got back home and the error code is 69-C00D36B2.
Full text: "Can't play this content because it may not be supported. For more info, go to http://www.xbox.com/support
. Status code: 69-C00D36B2
Like I said, these exact same files (most are DivX, I believe) played successfully with uShare before and off thumbdrives. I'm going to install uShare on this Amahi box and see if that works. If so, then there's got to be some way tog et the Xbox and DLNA playing nice. Well, I hope so, at least.Edit:
Yep, uShare works. Kinda. For some reason, it was trying to serve up the folder /var/hda/apps/ushare/files. Which the installer failed to create properly, but that's for another day (it's there, but it's corrupt and can't be removed). I changed the conf file to point to the /var/hda/files and it worked. Still, would rather be using DLNA.