Blender 3.1.1 features many bug fixes.
* Fix memory leak evaluating PyDrivers. (rBeff7e9aa45a)
* PyAPI: ID property group returns wrong type with iter(). (T94121)
* Grease Pencil > Stroke > Normalize Thickness Causes Crash. (T96352)
* GPencil: Fix unreported select error in Normalize operator. (rBaf6b88c629d)
* Unable to set active material output node using Python. (T96292)
* is_active_output stopped working correctly. (T96396)
* Nodegroups don't update the shaders anymore in 3.1. (T96402)
* Crash with Close Area menu 3D view. (T96416)
* Issue clicking on stem of arrow gizmos to scale on axis. (T96357)
* Armature corrupted after undo. (T96452)
* Overlapping Volumes broken in Cycles, GPU only (possible regression). (T96381)
* Multiscatter GGX regression with non-zero roughness and a bump texture on a non-manifold object. (T96417)
* New 3.1+ OBJ exporter no longer has "operator presets" nor a way to skip modifiers. (T96303)
* Crash when changing shader to nodegroup in properties. (T96386)
* GPencil: Fill freezes when use invert and click inside areas. (T96518)
* Fix object centers & geometry selecting meta-elements in edit-mode. (rB6aa45434623)
* Stereoscopy with Motion Blur crashes in Eevee. (T96572)
* C3D Import. (T14392)
* OBJ Export: wrong normals with scaled object. (T96430)
* New obj exporter: Scale factor is applied incorrectly. (T96415)
* New .obj exporter: Material groups not being written. (T96470)
* New OBJ exporter no longer groups faces by material, causing issues with some other apps (e.g. Procreate). (T96511)
* Crash when a curve object got an array modifier with a mesh object containing a vertex group set as cap. (T96494)
* Bake normals for multi-resolution object is broken. (T96401)
* Set ID for Instances not work in Blender 3.1. (T96420)
* Regression: Can not translate after selecting with Select Circle. (T96515)
* Regression: NLA crash when reordering tracks if no object is selected. (T96624)
* Crash on Geometry Nodes Edit Mode tap Tab. (T96316)
* Regression: Texture Mapping properties of texture nodes are not updated in 3D Viewport. (T96361)
* Regression: Crash when pressing F3 outside a Blender window if Developer extras is on. (T96705)
* snap does not work properly. (T96711)
* UV Editor doesn't work when GPU Subdivision in the Viewport is enabled. (T96372)
* Fix missing updates for external render engines rendering tiles. (rBc91d39e4735)
* Add Curve Extra Objects addon fails when adding Curvy Curve. (T96342)
* Regression: Script using bmesh.ops.wireframe and bmesh.ops.bevel does not work the same in 3.1 and in 3.01. (T96308)
* Regression: Crash when executing bpy.types.ShapeKey.normals_vertex_get. (T96294)
* Fix text editor failure to move the cursor for syntax errors. (rB694e20b1415)
* Gpencil: Inverted Fill makes extra stroke at origin (0,0,0). (T96790)
* Image editor: not updating after image operation. (rBf6e2c9bc97d)
* Regression: Blender 3.1 bake from multires not reflected in the Image Editor. (T96670)
* Regression: GPencil primitives handlers not working. (T96828)
* Regression: Snapping is broken with proportional editing. (T96812)
* Regression: Cutting a strip with keyframes in the VSE deletes the keyframes from the original (left) strip. (T96699)
* Regression: VSE Wipe transition does not work. (T96582)
* Heap corruption in file_browse_exec. (T96691)
* GPencil: Scripting weight_get cannot retrieve weights of certain vertex groups. (T96799)
* vertex paint face selction display bug gpu subdivision. (T96356)