1) confirmation email
perhaps an idea : is your site English or do you send email with accent or sepcial character?
in 1.9 I fixed the header encoding properly (for language not ascii) because otherwise some mailers stopped the message
2) change the theme in you user preference, some work better (ex:olive)
3) scroll vertically? use less modules and small page. Do you mean scroll horizontally? in this case change style, verify if some specail chars in the page but sometiimes the middle part is too big (ex: table)