Is this file at the location "X-Plane 11/Aircraft/X-Aviation/Cessna 172SP G5/plugins/G5/mac_x64/g5.xpl"
It is most likely either that file for some reason is missing or OS X is not loading the plugin, as it is compiled for MacOS 10.15 (though I should have some backwards compatibility to at least 10.14) and you are on 10.13. I am looking into that on my end to see if I need to get a separate build with more backwards compatibility.
From the looks of it, it appears that the X-Plane can't find the G5 plugin at all. Did you copy the installation from your other computer, or did you run the Mac installer?
The aircraft with a 3D integration are shown on our G5 Wiki here, the B58 is not among supported aircraft.
To integrate yourself, we have a guide here, but 3D integration requires access to source objects.
It looks like you have quite a few other plugins installed, my guess is one of them is messing with X-Plane's autopilot details. If you can upload your log.txt file, we can perhaps gain a bit more insight on what is going on.
Yes, the commands are all viewable through the command setting windows for both joystick and keyboard binding. All of our commands start with afm/islander/cmd
The commands/datarefs are still there, no commands were removed from the plugin. We simply switched the in-sim manipulators to use the toggle datarefs to help with usability.
The LR G1000 uses quite a bit of CPU time if you are CPU limited (which it sounds like you might be). With high objects set, X-Plane can really start to struggle. We will have some further tweaks coming, but our plugin uses a very minimal quantity of CPU resources besides the default LR G1000. It could potentially be a VRAM usage issue, we have 2K texture packs available, linked at the bottom of the page here: https://afmsim.com/m20-liveries/
Most people have had quite good results with the experimental flight model, both work well. We are going to be tuning for the experimental flight model soon, but for now you can go with either.
The brake handling is configured through X-Plane itself, we don't have a custom braking logic in place. We do however have a custom chock system with the brakes to simulate the chocks. Perhaps the chocks are engaged?
This latest log again does not show Gizmo plugin being installed. X-Plane plugins shouldn't be deleting themselves, so my guess would be some overactive antivirus seeing a false positive.
Yes, the HSI is getting a rebuild with the new 3D following Cirrus release, same with annunciations on Nav 2.
DME should be functional, same with fuel flow, can you send a screenshot of those not working, along with your log.txt?
I have not seen an XSaitekPanels configuration created for it yet, but there are commands and datarefs available for every switch so it should be possible to create a configuration, assuming that it can be user-configured.
The Gizmo plugin does not appear to be loaded/installed. This plugin is installed inside the global plugin directory and cannot be remove as it is what activates the aircraft.
OAT indicator is the gauge attached to the windshield behind the magnetic compass.
The cabin heat is shared with the pilots, there is no separate control for them.
Yes, that would be magneto 1 on the right engine if you are starting the right engine. I will check the rest of our documentation to see if we have a typo.