How to reproduce this issue:
1. Create an empty project
2. Import latest version of MapMagic 2 from the assetstore, with no other modules.
3. Create a template graph and open it.
4. Delete the erosion node and connect noise node with the output node.
5. Drag the graph asset onto scene view.
6. Select game object created in step 5
7. Go to "Tile Settings" in the Inspector, under the Map Magic Object component
8. Change "Main Resolution" to 1025.
9. Save the scene and enter play mode
10. Wait 3-15 seconds for a CDT.