1. As mentioned in a different thread, I had a Linear WD500Z-1 stop responding to any Zwave commands. So I deleted it from the A+ without going through the Remove step. Oops. Now I'm in a state where no amount of Add or Remove will have any effect.
2. I purchased a brand new light switch, GE 12724 (ZW3005) and this one also does not seem to do anything when trying to Add it.
3. Finally, I have an Aeotec Gen5 Mutlisensor that has a physical Zwave button. This also does nothing when the A+ is in either Add or Remove mode.
4. I was able to successfully pair the Zigbee Peanut plug.
At this point, no Zwave actions are happening. I can't pair any of the devices. I'm at a loss. I mentioned in another thread that my system log is spamming Segmentation fault errors, but I don't know if that is related to loss of Zwave functionality.