I've been using pro builder for the last month slowly building a house design and today I thought I would cleanup, merge objects and faces etc. Now some of my floors the main and second one is generating errors in the log and I cant select vertices. I can select faces and edges but not vertices. KeyNotFoundException: The given key was not present in the dictionary. System.Collections.Generic.Dictionary`2[TKey,TValue].get_Item (TKey key) (at <e1319b7195c343e79b385cd3aa43f5dc>:0) UnityEngine.ProBuilder.WingedEdge.GetWingedEdges (UnityEngine.ProBuilder.ProBuilderMesh mesh, System.Collections.Generic.IEnumerable`1[T] faces, System.Boolean oneWingPerFace) (at Library/PackageCacheemail@example.com/Runtime/Core/WingedEdge.cs:353) UnityEditor.ProBuilder.ElementGroup.GetFaceSelectionGroups (UnityEngine.ProBuilder.ProBuilderMesh mesh) (at Library/PackageCachefirstname.lastname@example.org/Editor/EditorCore/MeshAndElementSelection.cs:132) UnityEditor.ProBuilder.ElementGroup.GetElementGroups (UnityEngine.ProBuilder.ProBuilderMesh mesh, System.Boolean collectCoincident) (at Library/PackageCacheemail@example.com/Editor/EditorCore/MeshAndElementSelection.cs:107) UnityEditor.ProBuilder.MeshAndElementSelection..ctor (UnityEngine.ProBuilder.ProBuilderMesh mesh, System.Boolean collectCoincidentIndices) (at Library/PackageCachefirstname.lastname@example.org/Editor/EditorCore/MeshAndElementSelection.cs:31) UnityEditor.ProBuilder.PositionTool+MeshAndPositions..ctor (UnityEngine.ProBuilder.ProBuilderMesh mesh, UnityEngine.ProBuilder.PivotPoint pivot) (at Library/PackageCacheemail@example.com/Editor/EditorCore/PositionTool.cs:54) GUI Error: You are pushing more GUIClips than you are popping. Make sure they are balanced. UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr) I did create a backup before starting, though I would rather not want to do all the merging etc again. I have no custom code and just been using Pro Builder so seems pro builder bugged out somewhere.. Uploaded the current scene file of where I am at if anyone wants to take a look. As well as the bug I'm interested in any improvements and advice etc. I may have to detach the faces from the objects and rebuild them tops, bottoms and sides separately as I can still do that. Next stage was going to be split the floors up more into rooms by creating edges and faces. Here is the current progress for those that are wondering without downloading the scene file. I cull faces that are out of view hence why the box at the front looks broken plus has a terrain mesh for floor turned off while I work on other things.