Dell Data Protection | Security Tools does not encrypt OPAL SSD

So DDP|ST has been out of support for a bit and obviously hardware encryption has taken a bit of a knock lately, but some of you may be stuck with some Windows 7/OPAL setups for the time being so I'll write this up. The scenario was that DDP|ST was installed into an image - target machine was a Dell Latitude E7470 with a LiteON SED SSD. Everything was ticking along in the usual way until ready to hit "Encrypt" on the SED. On doing so... nothing happens. The Encrypt button is greyed but it is possible to back out of the section or close the UI entirely. I remembered overnight that I had seen this before - it required uninstalling and reinstalling the DDP|ST (including the usual PITA manual uninstall order, preserving Authentication data when asked, requiring reinstatement of the preboot text notices and removing undesired authentication methods). The log files for DDP|ST are in \ProgramData\dell\Dell Data Protection\ but as yet I haven't figured out a cause. Of course there are lots of other gotchas in PBA SED encryption (including OEM SSDs shipped without PSIDs so if you bungle it there's no getting that PBA off) but hopefully this saves someone a few hours of annoyance.

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