$this->email->subject() bug?

[eluser]Iverson[/eluser]
I'm sending an SMTP email using the email lib. I'm setting the variable like normal($this->email->subject($subject).

Code:

$subject = 'Email Test 2'   // works
$subject = 'Hey!' // doesn't work

WTF? Both return a success message from the debugger. I would include other details like config variables, but I don't see how they should be related in any way! FYI, I'm on a Windows 2003 box.