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Also experienced this on v1.18.2822.0 (Windows 10) with three WT instances and two "PopupHost" close buttons. Attempting to close one of the buttons through the taskbar popped up a "not...

I got around this by *keep opening* new WT instances until all buttons were gone, then exiting from the command line one by one.

Same here. I did some profiling with both perfetto and `time.perf_counter_ns` but couldn't find any hotspot... Maybe it's an e3nn_jax issue? 

> Hi, thank you for digging into this and collecting the different issues. As you have already figured out yourself, there is a new version on the way in `v1.0`...