Normally, pressing tab brings the cursor from text box to text box (and for the most part, this is still true). However, after you enter in name for the "To:" section in an outgoing message, pressing tab/enter just deletes the name you just put in. Pressing escape or using the mouse are functional alternatives, but the fact that this is the only exception (that I've found) to the rule is weird. Even as I'm typing this, I pressed tab to switch from the "Your idea" section to the "Please add more details" section.