No Ben, you didn’t imagine it. I’ve read it myself before (most likely on the disinformation highway

) I've used aluminum to melt beeswax with no problems.
Here’s what Cogshall & Morse write in their book “Beeswax’:
“Bison, Vainsell and Dye heated beeswax...............They found the wax was discolored by iron, brass, zinc and copper; the discoloration was greatest with iron, followed by the others, decreasingly, in the order listed. There was no appreciable discoloration when beeswax was heated in the presence of aluminum, nickel, platinum, pure tin, and stanless steel.”
As far as the alzheimer’s disease claim about aluminum, it isn’t all that difficult to find just about anything on the internet nowadays to back up any belief you happen to have. Yes, there has been speculation and controversy about aluminum and alzheimer’s for many years. Here’s another opinion:
http://www.alzheimers.org.uk/site/scripts/documents_info.php?documentID=99
But contracting alzheimer's disease by melting beeswax?!?!