sudo apt-get update && sudo apt-get dist-upgrade

for upgrading to the latest testing release. In case that you are already using the testing branch with the latest image you just need to upgrade.

It does not contain a new version of the Software, but a couple of Raspbian fixes related to the FabScan Software.

@danilo0702, I had the previous stable version and did "sudo apt-get update && sudo apt-get dist-upgrade". After that reboot and it worked for me. 

@yhellowt , I tried it on Saturday but it didn't work. It only works with a fresh image and the stable Line in the sources.list. Now it works, the server starts and I calibrate first. Thanks for the information

After following the German discussion, I installed the latest update this morning and the issue is resolved for me.

Now trying to make good sense of the scans. 

Thanks for all the hard effort @mario

@yhellowt , who did you solve the issue? Do you used the update from the 0.9.0 testing line or from the 0.8.2 stable  line?

Now trying to make good sense of the scans. 

Thanks for all the hard effort @mario

Due to the sudden change in performance I suspected a resent change in the browser (security or whatever) and checked with browsers using Windows 10, Ubuntu 18.04 and a raspberry Pi wall with the same problem.  I even created a new system on a SD card from an image file downloaded in January without wifi enabled and with a PC that had a bootable hard drive with Ubuntu that had not been updated for some time, and used a peer to peer connection in an attempt to duplicate the former working condition.  The same problem occurred.  

Upon checking tonight with wireless on apparently the software was updated to the latest post and works.  To verify, I also checked with the non-updated, no wifi connections which results in the problem.

Mario (if you will) please share what caused the problem and the solution. 

here is the log from the Chrome browser during scanning process. I hope this can help solve the issue:

lib.js:20381 Connected: true
app.js:1280 Websocket connected to ws://192.168.1.100/websocket
lib.js:20381 Object
lib.js:20381 Initing
lib.js:20381 State: IDLE
lib.js:20381 Object
app.js:1790 News request timeout...
lib.js:20381 Object
lib.js:20381 NEW STATE: SETTINGS
lib.js:20381 Object
lib.js:20381 Object
lib.js:20381 Object
lib.js:20381 NEW STATE: SCANNING
lib.js:20381 Objectstate: "SCANNING"__proto__: Object
lib.js:20381 Objectlevel: "info"message: "SCANNING_OBJECT"__proto__: Object
lib.js:20381 SCANNING_OBJECT
DevTools failed to load SourceMap: Could not load content for http://192.168.1.100/js/jsoneditor.map: HTTP error: status code 404, net::ERR_HTTP_RESPONSE_CODE_FAILURE

any updates on these issues? I am really trying to get this thing to work...