I'm now running version 20 and loving it. Thanks to Ben for answering my e-mail about whether I could do a firmware update with the pinheck board only at my desktop rather than at the machine. The answer was no--the pinheck board needs power. My PC desktop is far away from my pin, so I was avoiding lugging it to the basement, but once I did I had no trouble with the firmware update. The AV update was another story. I tried again and again but I kept getting an SFX error message when I put the updated SD card into the game. That's because I was not taking Ben's instructions literally enough. When he says "Copy the contents of the AMH_SD.zip file to your now-blank SD card," he really does mean "the contents of" (i.e., the DMD and SFX folders)--I had been copying the actual (parent) AMH_SD folder, despite the fact that Ben had even included a picture of what the resulting folder would look like. This is what you get when you write clear instructions for a dumb English major who has forgotten how to read. Thankfully, once I copied things correctly, all was well.
Before this, I had been considering going into the code to see if I could hyphenate "ghost locating" (in GLIR), but after this initially alarming experience I think maybe I'll just pretend the hyphen is there . . .