This is to help answer common questions. Feel free to add more.

1. Many of the wus: ps_sgr_210F5_3s complete but are given invalid status and 0 credit.

Cluster Physik:
As I said already, the invalid WUs have nothing to do with the application you use. It can be the stock app for a Mac, you will still have some invalid WUs. It is simply the "plausibility check" of the result on the server that sometimes decides the result can't be true (even if it is completely correct). That is probably caused by some strange parameter combinations in a WU, which delivers an extremely bad fitness. You shouldn't worry about this.

2. MilkyWay_GPU is still not active. No date given yet.

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Doesn't expecting the unexpected make the unexpected the expected?
If it makes sense, DON'T do it.