Yes, see below.
Lars Slovak has confirmed that this is an issue but is unable to give any indication as to when it will be fixed. When VCA support was added in the last iC Pro update (over a year ago) the job was only half done. For me, the main reason to use iC Pro is to allow musicians to set up their own cue mixes, but as this no longer works if I have the temerity to use the much hyped and badly designed VCA features in Nuendo, the app is as good as useless.