[arch-general] Pacman and package signing

I'm going to plead ignorance hear and have not been able to find the solution. I've done a google search, read the man pages, read the help documentation for gpg, and I still have a problem. If I sign the package with makepkg or manually with gpg --detach-sign, it creates a it creates a detached signature, .sig file. I have my key using pacman-key. When I attempt to install the package I get an error message "invalid or corrupted package (PGP signature)". If I manually sign the package with gpg --sign, every thing is fine. I quite sure this is something I've done wrong but I don't seem to be able (nice way of putting it) to be able to find this solution. WTF am I doing wrong. Myra -- Life's fun when your sick and psychotic!