@napcok, I just booted two computers with the new, shiny ISO.
There is a several years old problem with memtest that Manjaro, surprisingly, hasn’t fixed yet. It does not work because of a variable (if booting in BIOS mode). For EFI mode there is already an official package but the menu option is not even present in grub.
Those two seem easy to fix and I was wondering if you could please do it for Mabox. 