You use a German locale--do you use multiple keyboard layouts? As in bug 1338324, there is a conflict between Ctrl+Space (which I cannot confirm) as an XFCE shortcut and NBSP, which looks like it can be changed in Keyboard settings. If that is the case, this report is duplicate. I have described a couple other workarounds there.
You use a German locale--do you use multiple keyboard layouts? As in bug 1338324, there is a conflict between Ctrl+Space (which I cannot confirm) as an XFCE shortcut and NBSP, which looks like it can be changed in Keyboard settings. If that is the case, this report is duplicate. I have described a couple other workarounds there.