xDealer

Hi,
i just instilled the update on my website and everything is fine with the slider. including the "go back to top" button.
If you have modified templates then during theme updating you should be getting a window popup indicating that you have modified templates. you will need to select the newer version of templates during theme update.
if you haven't done that and you choose to select your customized templates during theme update then this is probably why the slider doesnt work or the back to top button
 
a re installation will fix the issue.
if you dont want to reinstall because of customization's then try to make a copy of the current theme you have and then delete it. ACP > Customization's > Themes
after that reinstall magnum theme from marketplace and copy paste your customizations from the theme you copied to the new one. but i strongly suggest you not to modify any kind of templates but custom.css.

Please click the revert button in the preset boxes
They are empty by default when you install the theme.
 

The ordering options are under the Options tab in the Database settings.