I believe you have to reboot to save changes
The splash screen doesn't seem to rotate or does the game list now loading message. But after you make the verticools change, hit escape, then exit attract mode, escape again for a prompt and then type in Sudo reboot. Saves your changes.
Ok i tried both methods, I attached pictures to show what I'm doing.
1) First pic shows what I currently see, the default horizontal image.
2) Second pic shows where I choose the layout, I tried with both Verticools and AttractmanVert
3) Third pic shows one method I tried to reboot, pressing left->left then selecting the reboot and force save changes option.
4) Fourth pic shows the other method I tried to reboot, hitting esc, exiting attract mode, hitting esc again, getting to a command prompt them typing sudo reboot.
Neither of the above methods works for me on 3.7, it still shows the default horizontal layout. I'm sure I've skipped a step someplace, not sure what just yet. Maybe 3.7 now needs changes to a config file someplace? The behavior has clearly changed from 3.6 so perhaps now text file mods are necessary?
EDIT: In case it matters, I'm using the 3.7 image that High Score Saves emailed out. Figured I'd mention that in case that 3.7 is slightly different than the 3.7 y'all are using.