I bumped into a new problem: Getting the Ad Placements working.
At first, I was confused what to do with regards to them. So I gave them a whirl. I mean, the new ones that got added in the final version of xenforo, not the pre-existing one that I had to find the line of code in page-container and/or forum_view.
When I reverted the old templates, I let go of the old ad placements, and re-added them to the new ad placement system. Only this time, without the borders so that I can com back a later time with a fix.
I added the ads into the new adplacements: At first the ads did not show up to the main forum page [ya know, the first thing you see when you get to your xenforo instance], but it showed up only after I cleared my browser's cache.
BUT the "message" display [ya know the threads you read or post in] did NOT show the ads that's supposed to be globally shown.
However, when I added the old ad placement banner to the page container template, not only does the old template that was was on the sidebar show up, but the NEW ad placement showed up too!
Here's an image of what I mean, Keep in mind, this is a default thread display, the old ad placement is on the top, the new one [the one without the border] is on the bottom, you will see the difference.
To see another thread example, here it is.