Various issues after installation

Hello,

I just bought this wonderful theme, but I encountered a few issues after installation.

First of all, using the default plugins included, bbpress and buddypress when installed crap out the admin interface, so what I did is remove them from the plugins folder and install the updated ones again from the wp-admin interface.

Secondly, after importing the demo, the slider on the “last news” page (homepage) is not working or showing, but there are various articles on the “slider” category.

Same thing for “Last Matches”, I can’t see anything, but I guess I need to add them first?

I’m sorry if it’s my fault, but from what I can see, the slider should be working.

Also, in the “Features” page I see these errors at the bottom of the page and in the footer the following errors:

[vc_single_image_effect image=”1891″ css_animation=”top-to-bottom” img_link_target=”_self” title=”Visual Composer”]
[vc_single_image_effect image=”1896″ css_animation=”top-to-bottom” img_link_target=”_self” title=”Custom forms”]
[vc_single_image_effect image=”1893″ css_animation=”top-to-bottom” img_link_target=”_self” title=”Clan page”]
[vc_single_image_effect image=”1894″ css_animation=”top-to-bottom” img_link_target=”_self” title=”Clan matches”]
[vc_single_image_effect image=”1892″ css_animation=”top-to-bottom” img_link_target=”_self” title=”Eye-catching design”]
[vc_single_image_effect image=”1895″ css_animation=”top-to-bottom” img_link_target=”_self” title=”Custom backgrounds”]

What is the issue?

Thanks in advance,
Andrea