I think there might be an difference based on migrated version. I have uploaded my tests to FTP, there you will find application with dll, simple form with texteditor that takes the key that was send with SendKey.Send().
With this is also RunApp thet runs another form and test if it is working, works fine.
Then I have taken latest version or Northwind (Gilad send me few days ago) made simple UIController and it worked FINE!!!
but on older version of Northwind (also included) I got same error as in our application.
Please check if you have any idea what if there is a simple few lines of code or do I need to upgrade whole ENV?
Thank you,