Hi.,
1) Kindly, Send your FTP details via the right bottom form located @http://themeforest.net/user/designthemes
2) This issues occurs because of your third party plugin conflicts so Please take a backup and while update theme you have add those custom css code in your end.
3) The problem was in our admin panel. We have fixed. Thanks for letting us know.
4) If you want to display your product image as like our demo page , please import product image resolution as 460 x 430.