Still not seeing OS X 10.7.3 on Software Update

Apple released OS X Lion 10.7.3 last Wednesday and on one of my machines I’m still not seeing this update. The picture above was taken just a few minutes ago on a machine still running 10.7.2. It appears that I’m not the only who’s observing this. Daring Fireball’s John Gruber also asked this question yesterday on Twitter:

It obviously hasn’t been pulled, but what’s wrong with Apples update mechanism that some people aren’t seeing the update? It might just be a caching problem, but after almost two days this should have been solved by now.

After waiting for some days, the update finally showed up this morning on the machine I didn’t manually update before. Interestingly it’s downloading the combo update, not the delta version.