After working fine for 4 days, some technical difficulties with Graffiti LIVE appeared JUST today and has broken the auto-sharing system- actually looks like an XBL issue BUT a patch is on the way to work around it.
It shouldn't take as long as this time to get it patched.
edit: OK it looks like everything is working again. I did end up pulling the game yesterday tho, so if you are looking for it and wondering where it went. :P Check back in a few weeks. The next patch should address the heavy slowdown when you accumulate 100+ drawings.