The pattern settings window once opened is reused with subsequent clicks on thumbnails.
It stays open until closed.
On Linux (Ubuntu 14.04) it seems, that it might not come to foreground (as on Windows and Mac) when reused.
So it might be hidden behind Sikuli IDE's main window, if it stays open and the main window is brought to foreground.
The pattern settings window once opened is reused with subsequent clicks on thumbnails.
It stays open until closed.
On Linux (Ubuntu 14.04) it seems, that it might not come to foreground (as on Windows and Mac) when reused.
So it might be hidden behind Sikuli IDE's main window, if it stays open and the main window is brought to foreground.
please check.