I don't have that issue, but you may find you need to copy the certificate into the System keychain, using Keychain Utility. Also use that tool to carefully examine the certificate - errors in certificates are somewhat common and will cause unpredictable behavior by apps that try to use them. Silly things like calling it "att.com" one place and "www.att.com" in another place. Compare the certificate carefully with another similar one and see if any of the settings, trust levels, roles, or privileges are different.
