My problem was/is:
I've now downloaded the latest version of sunlite, but now, there is another bug!
When you will just select a field, you must click on it and push the "Shift"-Buttom at the same time. That works perfect! But the problem is:
When I've selected a buttom / a field, I can't use the combination "Alt+P" OR "Alt+D", it doesn't work.

So I've reinstalled the older version from 1. dez., there I haven't any problems.

Best regards from Switzerland
Leander