Okay, since Hijack v202 the Source/Power button on my RioCar has been "touchy", and I'm sure others have noticed it as well.
It turns out that this is due in some way to the two-line "illuminated button hack patch" from Brian, which was first included in v202. So, I'm disabling that hack by default as of Hijack v217, until we figure out what causes it and how to work around it.
For the few who actually have the button kit hardware installed, you can turn the patch back on in config.ini:
[hijack]
buttonhack_enabled=1
Cheers