is that possible?

http://www.pdpatchrepo.info/hurleur/number-sign-in-cnv.pd

I don't think it is. I believe there's something going on on the gui side that treats # and $ the same. If you try to set a send or receive name of a gui object with #, the same thing happens.

This seems to be fixed in pd0.44.1!

Is mac still on pd 43.4 though?