We have upgraded Moodle after finishing the enrollment process in the february 2013. Now we are starting new courses and have faced an issue, that self-enrolled students got e-mails on behalf of the lectors of that course, but not with the welcome message options.
We have several lectors in this course, some of them are real accounts for interaction with students, and other are fake accounts with no real mail (well, like firstname.lastname@example.org).
By default, when all lectors are present, welcome message show name of the fake lector and correct supportemail address. If we unenroll this lector from the course, welcome message appears like sent from real person (real lector`s name, and his account email, gmail also show me his picture, etc).
Before 2.4.3 everything was just ok, I've found some old welcome messages, they used correct supportname and supportemail options.
We tried to upgrade to 2.4.6 but this had not help.
If you need any information from out moodle installation (or e-mails copies), I can provide it. Also I can provide the link and keywords to the course to test messages.