email from Hushmail will not decrpyt in Slyph

If I send an email from my PC using Slypheed to a Hushmail account, encrpyting and decrypting work okay.
But, receving an email from Hushmail, I get an error that I don’t have the secrect key to decryt it.

heres what I have
Slypheed 2.4
WinPT keymanager
Hushmail cypher RSA
my cypher DSA/ELG