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Had to upgrade to Buster but everything now works perfectly.

Didn't read the whole thread. Ill try the suggested fixes mentioned

Have similar issue. Thought it was a bad Micro SD card until I saw this thread. Virtually lost control of all my Z-Wave devices now,
Considering moving to a new Raspberry PI with fresh installation, but unable to create backup without the web interface working...

Getting this error in the log: [2020-07-23 23:15:12.367] [I] [core] TypeError: undefined is not a function at self.controller.devices.create.handler (automation/modules/ZWave/index.js:6074:10) at _.extend.performCommand (automation/classes/VirtualDevice.js:316:25) at ZAutomationAPIWebRequest._.exten...

Marking this as solved then

Sorted!
What fixed it was logging in using a different browser. Chrome is normally preferred but not this time aparently.

Thanks for the suggestion. Already tried that - no success, but using edge fixed the issue

Just upgraded the Z-Way-server to 3.0.4 and having issues logging in.
Does no longer accept my password - but also loads with error.

Is this something known?