Safe option to avoid sudden crush for driver props change.
It is not bug request of add on, but I recently noticed, when change expression etc which use bone driver often shut-down blender with cycles view for recent 2.9 versions. when there are many meshes.
I suspect it related code which up-date scene correctly, (though I do not remember detail )
And it depend my PC but if I keep wireframe or other view, it not cause this issue. (I sedom see shut down) Though I try to keep other view (more low cost for performance) but to make expression detail I hope to use cycles view. but everytime manually change view mode and tweak prop value, change cycles and confrim how it effect,, not good work-flow,
so if there is option with checkbox, which change viewport render mode as more low cost view then after set value, return it to current viewport render mode.
…though I do not think it is easy,,
(maybe wire frame view is most stable with driver props tweaking, for heavy poligons scene)
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I think even though I simply hide or visible some bones or posing with cycles preview, blender 2.90 to 2.92 often clash suddenly.
(maybe I already append many meshes with rig, but I hide most of them. but therer seems too many shape keys for the mesh,,)
It seems better to ask blender dev or I need to change my PC I suppose.. I close this request,