pose edge refinement does not work as expected

[Zhiozhio]

I am running example 3 using the same dataset, centrair_101_graph, provided by the author. The other features seems fine to me, but when I ran "Pose Edge Refinement" followed by the guidance and set the same parameters and click "Start", there just a "Running" spin and nothing more happened. My "Optimization cycle" is still "0/5". Nor the output from command line.

Is it a bug or I have to wait longer? (btw, I have waited for more than 10 min)