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Michael, thanks a lot !
PROBLEM SOLVED

I also de-installed and re-installed the windows UZB driver as provided by z-uno project using the 'hdwwiz' command line tool in windows. When re-installed I get the message that the device might not be working properly because of a code 10 "Device does not start"

Yes, that is what I mean. Initially I had a COM device called UZB on COM21 that I selected to upload my first sketch to. Now, after 1 successful upload of the example sketch 'SimpleDimmer', this UZB device on COM21 is not available anymore, also not after multiple attempts to put the z-uno in rescue...

I re-compiled and tried to upload "SimpleDimmer" example resulting in error. Here is the content of log file "uCxx-2016-10-18": DEBUG [2016-10-18 19:02:21,806] Starting on Windows. ARGS:C:\Users\Gast\AppData\Roaming\ARDUIN~1\packages\Z-Uno\tools\ZUNO_T~1\0008~1.10\ZUNO_T~1\compil...

Additional info: I am running windows 7. I installed the windows z-uno usb driver. I downloaded the sketch 'simple dimmer' example (which still works by the way) and since then the z-uno is not recognized anymore by my pc in any way, also not after putting in rescue mode. I tried several usb ports, ...

Not sure if it is the dot or the space in the file path. Space also seems to be an issue I read in this forum. ..

Below the content of the arduino message box when trying to upload sketch. As mentioned, it will try to do so via COM1 (which is the only option I can choose from). My computer does not recognize the device when plugged in the USB port, also not after putting z-uno in rescue mode. C:\Users\Gast\AppD...

The rescue mode did not solve this issue for me. Rescue mode did indeed stop running sketch code but still no valid com port in arduino available. Well actually I get COM1 but when trying to upload I get a message that either the com port is not valid or board not present.

I have a similar issue probably with same root cause. This is definitely not an arduino issue since I only got this problem after z-uno install. I get compiler error because it cannot handle a path name containing a dot ".". In my case my user name is "C. Battistella" which is pa...