Some issues with mobile devices  

My settings: 

Hi @timheidinger,

Use this CSS code to fix these issues. Put this code in Dashboard > Forums > Settings > Styles Tab > Custom CSS Code textarea. Save it, delete all caches, navigate on forum front-end and press Ctrl+F5 to reset browser cache:

#wpforo-wrap .wpforo-post-content iframe{
   width: 100%!important;
}
#wpforo-wrap .wpforo-post-content .wpf-video{
   width: 100%!important; height: auto!important;
}
#wpforo-wrap .wpforo-post-content .wpf-video iframe{
   width: 100%!important; height: 30vw!important;
}

Thanks! This solution has solved most of the problems.

However the instagram error persists:

For the Instagram add this CSS code, and don't forget deleting all caches and pressing Ctrl+F5 on forum front-end:

#wpforo-wrap .wpforo-post-content iframe.instagram-media {
width: 100% !important;
max-width: 100% !important;
min-width: 100% !important;
}