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That's an issue for all BoincTasks versions 1.75 and below.
I pushed V 1.78 to release as 1.76 fixes this problem.
https://efmer.com/download-boinctasks/

Brilliant! many thanks.
Installing 1.78 did indeed fix the issue.

For info, I have the same issue, under both BOINC 7.12 and 7.10.
Just updated BoincTasks to 1.75 couple of days ago (I'm slow); Since then, the local BOINC client has been reporting that cannot detect any GPUs on startup.

But if I start the local instance from BOINC Manager, the BOINC client _does_ find my GPUs - so it is not a Windows, BOINC or Nvidia driver issue (all are latest version, btw).

In addition, if I start the client with BOINC manager, then start BoincTasks, things run normally. But if I stop and restart the client within BoincTasks, the GPUs are again invisible to BOINC.

So I'm afraid this does look like an incompatibility in BoincTasks 1.75 ...