Clicking the Edit Tile Collision Polygon button in the tilemap window does nothing.
Double clicking the desired tile opens up the image editor window just fine though.
Windows 7 64- 152 beta
Construct 2 version:
Works for me. I highlight a tile and click Edit icon and it pops up the Collision window.
Maybe try Reset Dialogs?
You have to select a tile before the button enables. Closing, please provide complete steps to reproduce the issue if you still think there's a problem.
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Resetting the dialogs worked! how odd.