>>Since today, I've noticed that the distinct appearance (font, colour, italicized) of message signatures has disappeared. Also, there no longer appears to be a blank line after the message, and before the start of the signature. The net effect is it's hard to distinguish the message body from the signature.
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>I've noticed the same also and in addition when I click on the replies to my messages, the list doesn't seem to be properly sized.

It's funny, your sig is the only one I've seen today that looks normal - purple font, italicized, blank line before the start of your sig. Everyone else's that I've seen so far seems to have changed.

Now, my sig is back to normal except for the colour. Maybe Michel is working on it as we speak.