Why don't some widgets work on Cyanogen? I have a HTC Hero CDMA that I upgraded to Cyanogen 6.  I'm on version 6.0.0-Heroc-testing2.  Before installing Cyanogen, I had the official Twitter widget and official Facebook widget on one of my screens.  Ever since upgrading, I have not been able to add the Facebook widget or Twitter Widget.  Both of the apps work fine, but when I go to the list of widgets I can add, neither of them is there.  I'm using the default home screen/launcher that comes with Cyanogen.  Other widgets such as Beautiful Widgets work just fine.

Is this a problem with Cyanogen, the home screen, or something else?  I have a hard time believing these widgets are only compatible with HTC Sense.
Can you download another home launcher like LauncherPro (I highly recommend it) and see if the widgets also don't work there?  It could be a problem with the launcher you are using (ADW or Launcher2).  Or you could re-flash CM6 with the other launcher than the one you chose.

If these are the official Twitter/Facebook app widgets, then I doubt it is because of HTC Sense no longer being available.

Additionally it sounds like you are running a test build of CM6, so it may be a bug.  Check out their forums to see if anyone else has your problem or to report the issue.