Yes, same with CB11pro. I know (the hard way). I do all my unmixing in SP8 pro standalone app ,and export the unmixed files to wawe files and import them to cubase. Sadly, all the extra manual work I have to do is just what computers are designed to do.
I am just waiting for the programmers at Steinberg to get this. Is says that they are figuring this out and they been on it for more than a year now. We just have to wait I think.
Spectralayers and Cubase works together
via ARA integration. Meaning you can use SL inside CB as if it was part of CB and you can edit your files/tracks just where they are in CB. Else you have to export to SL do some SLing and put them back in CB again.
Unmix a short soundclip inside CB (30 sec. Stereo) makes your projectfile (.cpr) grov from MB to GB
Dont know bout Nuendo but CB crashes without warning trying to save files over c:a 4GB the ongoing work and the file you lodaded is,gone forever. If you are
SL-ing ( like unmixing) and .cpr file grows tog big you are in the same trouble. CB just stops and you have to kill it.