Kisirani, "your friendly neighborhood World Designer" posted earlier tonight that they have a fix for the rather benign (or slightly annoying, depending on your take) bug that calls out "The Ice Stone has melted!" every once in a while.
The fix will require the realms to be restarted, and according to Kisirani they will "be doing [the restarts] off-peak so we don't interrupt this evening's gameplay."
So right on, Kisirani.
Mystery of the melting ice solved.
Now... about those clams...