Problems arming with v3.3rc5

I'm a latecomer to beta testing v3.3.

I've had many successful flights with v3.2 but with v3.3rc5 I often cannot get it to arm. APM Planner says it needs a "3D Fix", yet I have 8 or more satellites and hdop of 1.6 - 1.9. I've even cranked up the HDOP

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