Thanks, I thought it would be something like that.
The thing is, I don't intend to use the V Collection through Sonarworks. I use it for other stuff, so it's there, but not even selected as the output for Windows most of the time.
In any case now they seem to be co-existing happily -fingers crossed- but now I've got the problem I've already read in other posts, with V Collection not remembering the Audio Settings and defaulting to Generic Low Latency ASIO every time. Oh well...
Edit: I've decided that, since I only use Sonarworks Systemwide from time to time, I've changed the settings so it doesn't start automatically on Windows start. And whenever I need it, I'll just launch it manually.
This seems to have sorted out all the problems with the V Collection, and it's now running 100% as it's supposed to.