Somewhere along the line it lost CC and only showed BCC.
// It is also called automatically during a Reply when CC is pre-populated.
function make_cc_bcc_visible() {
document.getElementById("ctdl-cc-bcc-buttons").style.display = "none";
+ document.getElementById("ctdl-compose-cc-label").style.display = "block";
+ document.getElementById("ctdl-compose-cc-field").style.display = "block";
document.getElementById("ctdl-compose-bcc-label").style.display = "block";
document.getElementById("ctdl-compose-bcc-field").style.display = "block";
}