For me, the fix was:

Using the 1.5 disk image
Ensuring that my roms are in the SMD format, and not the bin format. <– realistically this was probably the fix the entire time. I used a program called SBWin to convert between bin, md and SMD. Beware however, this program comes loaded with adware crap that you will either need to not install, or uninstall later. I seriously recommend sandboxing this when and installing. Seriously.

Since I’m pretty n00b, I’m not too sure how to go about running Dispmanx, configuring, etc. So it is potentially better to not have to worry about it in this instance.