A translated report from the German forums…
The import of scenes from Poser 12 Early Access does not seem to work so well with the current Vue version. According to Walther Beck, from Vue Support, there are apparently inconsistencies.
Vue import of Poser scenes has always been excellent, something that was honed and crafted and aligned over many years. There was a minor glitch with the Vue 2016 R4 patch (Poser 11.2 scene saves may not open correctly in Vue 2016 R4), but this bug was fixed in Vue 2016 R5. But after that, the compatibility has so far continued under the new ownerships.
Let’s hope the problems are not too difficult to fix, and that Vue keeps the ability to nicely import Poser scenes. Vue R6 should be out relatively soon, and that should hopefully fix it.