Validate failures have started again. Same computer, no changes that I am aware of. The WUs have normal runtimes, just the result is empty so looks like there is some sort of breakdown in communication between the wrapper and DNETC client.

Here is a good result: 4876994

Here is a bad result: 4972525

I installed Cat 11.11. No change. Have just rebooted will see if that makes any difference

(Update: first WU after reboot has validated. So far so good...)