Thanks once more to the sterling work of Jacques Distler, the original Café is up and running again. So, please go there, rather than here, for all your mathematical, physical and philosophical needs.
The software problems seem to be mostly fixed. One or two people still find themselves unable to leave comments. If this happens to you, please tell me or one of the other hosts. We’ll post the comment for you and see if we can get the problem sorted out. (And if you just can’t wait to get that comment into cyberspace, you can put it at the loose ends entry at this site.)
Thanks for your patience.