Hi, I am getting some warnings with 2.5.8.1 and Unity 2017.1.0f3...
>Shader warning in 'Hidden/tk2d/EditorUtility': Use of UNITY_MATRIX_MV is detected. To transform a vertex into view space, consider using UnityObjectToViewPos for better performance.
>Assembly: 'D:/PROJECT/Assets/TK2DROOT/tk2d/Editor/tk2dSkin.dll' uses obsolete Unity API (UnityUpgradable)
And this warning:
>SendMessage cannot be called during Awake, CheckConsistency, or OnValidate UnityEngine.MeshFilter:set_sharedMesh(Mesh)
for files:
tk2dSprite:OnValidate() (118)
tk2dSlicedSprite:OnValidate() (137)
tk2dTextMesh:OnValidate() (388)
Hope this can help.
Thanks!