Notabene and Parallels

I use a wordprocessor called Notabene which is essential for my work. Notabene takes over and reprogrammes the keyboard when it is active. The reprogramming needs control over the CTRL, SHIFT and OPTION keys. If, for example I want to lower-case a wword, I can do so by pressing SHIFT+CONTROL+SPACE. However, this does currently not work for me. I remeber that in a previous incarnation of the installation I solved the problem, but I have forgotten what I did. Can anyone help?