This is can be one of two things;

1, The tool did not close down properly last time.

You just need to maximise the window through task manager. So open task manager and right click on the Card Test Controller application or Developer application and select Maximise.

If that does not work try the following;

2, One of the config files has been corrupted;

C:\Users\**User**\AppData\Local

And delete any ICC Solutions folders in there. Then run the tool, you may need to repeat step 1 again.