[2016-05-06 17:39:16.634] [D] [zway] SENDING: ( 01 03 00 07 FB )
[2016-05-06 17:39:16.836] [I] [zway] Job 0x07 (Get controller info and supported function classes): No ACK received before timeout
[2016-05-06 17:39:16.836] [W] [zway] Job 0x07 (Get controller info and supported function classes) dropped: too many resends
[2016-05-06 17:39:16.836] [D] [zway] Job 0x07 (Get controller info and supported function classes): fail
[2016-05-06 17:39:16.836] [C] [zway] Get Serial API Capabilities returned zero.
[2016-05-06 17:39:16.836] [I] [zway] Removing job: Get controller info and supported function classes
[2016-05-06 17:39:16.846] [D] [zway] Worker thread exit point
[2016-05-06 17:39:16.846] [D] [zway] Worker thread successfully finished
[2016-05-06 17:39:16.847] [E] [zway] SaveData will not save data since it wasn't loaded. This is to prevent data loss.
[2016-05-06 17:39:16.864] [I] [core] Notification: critical (z-wave): Cannot start Z-Wave binding: Error: Bad data - communication failed
So in the short time I have been playing with this I went into the Raspberry Pi Configuration and turned off serial under interfaces and that has seemed to fix it for me. Might want to try it on yours as well.
That absolutely solved my problem! Stupid question maybe, but what made you even think to check that? I'm new to the Raspberry Pi and I don't know that I would have thought to turn off that specific interface. It makes sense now that I did though!