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I've upgraded to Jessie.

The Expert UI reports "Error handling data from server" as well as " 404 Not Found. Requested data does not exists".

In the /var/log/z-way-server.log file I've found the following-

[2015-10-19 10:02:38.478] [core] Instantiating module 1 from class ZWave
[2015-10-19 10:02:38.480] [core] --- Starting module Z-Wave Network Access
[2015-10-19 10:02:38.509] [E] [zway] SaveData will not save data since it wasn't loaded. This is to prevent data loss.
[2015-10-19 10:02:38.516] [core] Notification: critical (z-wave): Cannot start Z-Wave binding: Error: Invalid config

I did perform the following but no joy;

sudo ln -s /usr/lib/arm-linux-gnueabihf/libarchive.so.13.1.2 /usr/lib/arm-linux-gnueabihf/libarchive.so.12

I've seen problems with time going invalid on the IP:8083/smarthome/#/include page as well.

Has anybody seen this and know of a fix? Is is a problem in core networking?

Invalid config means there's some folders missing under /opt/z-way-server (like translations, zddx or config).
Please check if these folders are present.