I can now confirm that somewhere from 42XX and 4305 virtual folders have disappeared. The folders are still on my hard drive but PB seems to have forgotten them.
I have set-up the folders again and will monitor them.
BTW - after installing 4306 today the same issue of no D&D occurred. But when I closed PB and restarted, it was back. Why does this just happen immediately after an install?
customized Desktop PC (Haswell i7 4770 3.4 gHz with 32 GB RAM), Windows 10 Pro 64-bit, 256 GB SSD, and a Microsoft Surface Pro 6, Windows 10, 512 GB SSD, 16 GB ram, i5