Yes - highlighting on edges and vertices in element mode still workds as before. The selected polygons are also registered by ProBuilder regularly just like before - just that I can't see how many and which faces I've selected in face mode any more. I've had the issue with an older installation of proBuilder before and got rid of it by deleting the whole 6by7 (resp. ProCore) folder and reinstalling fresh. Since the documentation says that it is not recommended in a project to delete the folder I hesitate to try this, though. Also it's been happening before and I can't see any regularity when it's happening. I can't get it back either except with reinstall or a fresh project.