Hi,

I need to know which version of atmel studio you used 6.2 or 7?

You can delete the "HK_CURRENT_USER\Software\Visual Micro" registry key entirely then you should be prompted to add your arduino location when visual micro next starts.

To uninstall the older 6.2 version of visual micro you do so via "control panel>add or remove programs>Visual Micro/Arduino"

To uninstall/install the newer extension version of visual micro for VS2013 do so inside the Ide via "Tools>Extensions and Updates"

Let me know which versions you installed. 

ps: Status check - The older version, if installed, will show up under "tools>addin manager" the newer in "tools>extensions manager"

Try a sketch book location without non ascii chars

Please post the symbols in your screen shot as text so I can try

Hi,

Yes strange but lets be clear about a few things to try/check in the following order:-

A) You have deleted the visual micro registry key mentioned above so that we don't need to check what settings you have altered?

1) You have set the arduino ide location to a valid path where the .exe exists
2) You leave the optional sketchbook folder empty which will then correctly default
3) You have run the arduino 1.6.6 ide at least once and then started VS
4) You have uninstalled 1.6.6, then deleted the "program files (x86)\arduino" folder then reinstalled arduino to ensure that no invalid historic config exists
5) You have renamed the "documents\arduino" folder so that it can't be found then restarted VS

?

Thanks

I'd like to mention again that when I do select sketch directory and if it contains hardware folder from Arduino installation and if I select ide folder to some other dir - I do get list of arduino boards and almost everything works ok, except for compiling and staff that uses arduino executables, of course...

My pc does not have any non-ascii chars in it. As the user name.

Here's trace output:
Application      Begin
Status      Application - Extenders Created
Mode      AfterStartup
Status      AddinKickOff - Setup temp commands required
Status      AddinKickOff - Command event obtained
Status      Launched - Mcu Init
Info      MyVisualMicro location C:\Users\sns\Documents\Visual Micro
Status      Unable to select the current application
System.NullReferenceException: Object reference not set to an instance of an object.
   at Visual.Micro.MiroAppAPI.MCUApplication.get_runtimeBoardsList()
   at Visual.Micro.MiroAppAPI.SketchBase.setCurrentMcuApp(String sAppName)
Status      Available application configuations =  11
Status      Launched. Application configurations loaded = 11
Create UI command items      Begin
Create UI command items      End
Launch      Complete
Get      CustomToolBarObjects