Here are some answers :)
1) To create the magazine layout. Create a page and select the magazine page template. just make sure in reading settings for posts you don’t have a page selected.
2) Green screen. Let me know if you are still getting this. All looks fine this end.
3) Testimonials page. WooThemes have now released a testimonials plugin that should do the trick for you. Here’s the link https://wordpress.org/plugins/testimonials-by-woothemes/. To be honest we never use it, we just layout testimonials on a page as we would any normal page :)
I’ll be updating the Canvas tutorial on the Academy as soon as Canvas Version 6 is released :)
Hope those help,