Mark is a bit frustrated with OS X Mavericks because he can't use zoom control with his track pad anymore. Leo says that Mavericks has a few odd changes and that the two finger scroll up may have been part of those changes. He may be able to look in system preferences to see if it can be re-enabled.
Mark also has issues with Gmail in OS X. Leo says that it may just be a client issue. Leo uses GMail with with his own domain name and then forwards that domain email address to Gmail. He also uses FastMail as his IMAP server.