For the cover photo, you needed to decide if you were going to use the functionality within Buddypress or the functionality in BP Cover Photo plugin. I enabled “Leave BP Cover plugin functionality instead of BP 2.4 core” in Settings > Buddypress and it works.
For invites, have you talked with the plugin developer? Have you checked for plugin conflicts? Does it work with the WP 2015 Theme? Looks like the plugin hasnt been updated in over 2 months. Within those two months, WP has been released an update and buddypress has released 2 updates. Perhaps its not compatible?
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