I don't have premultiplied alpha on and am using both the included SolidVertex and BlendedVertex shaders. Strange thing is that I am not noticing this problem with tilemaps using sprite collections without sprite sheets, only the ones with them. When I turn on premultiplied alpha, the transparent ares fill black instead of white. Also, to clarify, I am not noticing this in either the the sprite collection editor or the final render data, only in the tilemap palette.
Maybe there is something completely obvious that I am overlooking? I will try re-creating from scratch.
Also, probably completely unrelated, but I've gotten this error two or three times. Not sure what I did to get it:
ArgumentException: Getting control 4's position in a group with only 4 controls when doing mouseUp
Aborting
UnityEngine.GUILayoutGroup.GetNext ()
UnityEngine.GUILayoutUtility.DoGetRect (Single minWidth, Single maxWidth, Single minHeight, Single maxHeight, UnityEngine.GUIStyle style, UnityEngine.GUILayoutOption[] options)
UnityEngine.GUILayoutUtility.GetRect (Single width, Single height, UnityEngine.GUIStyle style, UnityEngine.GUILayoutOption[] options)
UnityEngine.GUILayout.Space (Single pixels)
tk2dTileMapEditor.DrawTileDataSetupPanel () (at Assets/TK2DROOT/tk2d/Editor/Tilemap/tk2dTileMapEditor.cs:240)
tk2dTileMapEditor.OnInspectorGUI () (at Assets/TK2DROOT/tk2d/Editor/Tilemap/tk2dTileMapEditor.cs:1021)
UnityEditor.InspectorWindow.DrawEditors (Boolean isRepaintEvent, UnityEditor.Editor[] editors, Boolean eyeDropperDirty)
UnityEditor.InspectorWindow.OnGUI ()
System.Reflection.MonoMethod.Invoke (System.Object obj, BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture)