V1.0.6 (downloaded on 2018-09-04)
Mac OS X 10.13.6
Newly installed SG’s Rock Temple.
Steps:
Opened MapForge.
Selected any pack with tiles. (Tiles was pre-selected as Type)
Selected stamp tool.
Selected any type of tile
Selected specific tile (any) in bottom ribbon.
Click once on canvas to place the tile once.
Immediately thereafter, press Cmd+Z to undo the first tile stamped.
Error occurs.
If I click no, the application exits.
If I click yes, the undo does not happen, and indeed every following undo results in the same error.
Hope you can fix it. :-)
/Jens