Hoping somebody can help me out, as I don't see a similar thread in the forums already.
I just realized my Twitter and Google Reader updates seem to have broken when I upgraded to 4.25/motion.
However, I know my Action Streams setup is working fine otherwise: my Brightkite updates are publishing as expected. I don't see any clear errors in the activity log, either.
I also discovered an unrelated AS problem, that may be an outright bug: I hold comments on my entries for moderation, but when I (as blog admin) move a comment from my blog (by a random user) from the comment Spam folder to "publish", my AS stream says that *I* commented on my blog entry, which isn't accurate.
Reported on Movable Type 4.2
Shoulda spotted this earlier, but the reason Twitter/Reader etc weren't showing up was because the options to display updates were somehow un-checked in the "other profiles" section. D'oh. Far as I can tell, that changed as a result of upgrading.