Morning Lads,
Actually the problem is not in the NetTalk build at all. (So you can use 8.41 with no problem.)
The problem is in the Cryptonite install, which was installing really old OpenSSL DLL's into the BIN folder, overwriting the NetTalk ones there. Which is why re-installing _any_ NT version would appear to "fix" the problem.
I have updated the Cryptonite install So I think it should be ok now.
cheers
Bruce