Upload while not logged in.
Register new user.
Enter email address.
Press TAB to go into the first password field. It will go to the confirm password field.
In general the TAB order is wrong on this form.
Workaround is clicking with the mouse, but it is not convenient. Pressing ENTER to jump to the next field does not work either.
Also, pressing the tab key will select text fields in the dialog behind the Register dialog.