There is another update with an "official fix" which just includes modifying your App.pm file in [mt_install]/lib/MT directory. Get your 3.16 relogin fix on here
The login problem went away but then went haywire again. The messages left by Shelley of Six Apart on the current official fix are... If they're going to require existing users (pre 3.16) who to move their install to a subdirectory and redict their URLs. Well. Not smart. Really not smart. Stuff like that would be a reason corporate platforms shouldn't use MT. Anyhow. Aside from resisting a ranting of scorn upon six apart and Shelley, the constructive thing to do is to point out the fix.
It's line 583 of App.pm in 3.16 - the first three lines will look like this when you get there:CODE
sub app_path {
my $app = shift;
return $app->{__path} if exists $app->{__path};and like this when you leave:
CODE
sub app_path {
my $app = shift;
return $app->mt_path;
