Cura 3.6 will not connect to my printer...

[maxlan 0]

Hi, 
Cura cannot connect to my printer. "Monitor" never shows a tick and none of the buttons work.

It seems to autodetect com3, it shows it in the corner of the monitor window.
(It's a Mendel Prusa, I've tried a type of Prusa i3, Mendel90 and Custom FFF)

There are some weird messages in the log file :
 

2019-01-05 12:38:19,420 - DEBUG - [Thread-2] USBPrinting.AutoDetectBaudJob.run [49]: Checking COM3 if baud rate 115200 works. Retry nr: 0. Wait timeout: 3
2019-01-05 12:38:21,006 - DEBUG - [Thread-2] USBPrinting.AutoDetectBaudJob.run [79]: Detected baud rate 115200 on serial COM3 on retry 0 with after 0.07 seconds.
2019-01-05 12:38:21,129 - WARNING - [MainThread] UM.Qt.QtApplication.__onQmlWarning [352]: file:///C:/Program Files/Ultimaker Cura 3.6/resources/qml/Menus/ConfigurationMenu/PrintCoreConfiguration.qml:73: TypeError: Cannot read property 'name' of null
2019-01-05 12:38:21,261 - DEBUG - [MainThread] UM.Controller.setActiveStage [159]: Setting active stage to MonitorStage
2019-01-05 12:38:21,367 - WARNING - [MainThread] UM.Qt.QtApplication.__onQmlWarning [352]: file:///C:/Program Files/Ultimaker Cura 3.6/resources/qml/Menus/ConfigurationMenu/PrintCoreConfiguration.qml:73: TypeError: Cannot read property 'name' of null
2019-01-05 12:38:21,990 - INFO - [MainThread] cura.Machines.MachineErrorChecker._setResult [181]: Error check finished, result = False, time = 4.3s
2019-01-05 12:38:28,677 - DEBUG - [MainThread] cura.AutoSave._onTimeout [48]: Autosaving preferences, instances and profiles
2019-01-05 12:38:30,377 - INFO - [MainThread] cura.MachineActionManager.addDefaultMachineActions [72]: Default machine actions added for machine definition [prusa_i3]
2019-01-05 12:38:30,635 - DEBUG - [MainThread] UM.Logger.logException [84]: Exception: An exception occurred in inherit function =extruderValue(adhesion_extruder_nr, 'adhesion_type'): '0'
2019-01-05 12:38:30,637 - DEBUG - [MainThread] UM.Logger.logException [88]: Traceback (most recent call last):
2019-01-05 12:38:30,640 - DEBUG - [MainThread] UM.Logger.logException [88]:   File "X:\3.6\build\inst\lib\python3.5\site-packages\UM\Settings\SettingFunction.py", line 95, in __call__
2019-01-05 12:38:30,642 - DEBUG - [MainThread] UM.Logger.logException [88]:   File "<UM.Settings.SettingFunction (0x2237de61438) =extruderValue(adhesion_extruder_nr, 'adhesion_type') >", line 1, in <module>
2019-01-05 12:38:30,644 - DEBUG - [MainThread] UM.Logger.logException [88]:   File "X:\3.6\build\inst\lib\python3.5\site-packages\cura\Settings\CuraFormulaFunctions.py", line 41, in getValueInExtruder
2019-01-05 12:38:30,646 - DEBUG - [MainThread] UM.Logger.logException [88]: KeyError: '0'

etc...

 

I have tried remove/reinstallation already.

Anyone an idea or do I just stick to repetier?

[nallath 1,123]

The errors have nothing to do with the USB printer not getting connected.