My problem is similar to one listed in 2-11 (and now expired). I have a Brother MFC-7840W on a pc running Windows 7 (64 bit). I can print all documents with no problems, but I can't print envelopes. I use the "mailings" tab and "envelopes" option, and the address shows up where it should. I hit "print", the computer sends the info, the printer says it's receiving the info, the envelope goes through, but comes out blank. No return address or delivery address. To make sure it wasnt a formatting issue, I tried printing on a full sheet of paper. Still nothing.I called Brother support, gone through diagnostics with them, and they say the printer is working fine - it's a computer problem.