When I open procedures editor, and I want to place a block of fire instead of another block (X) which is triggered if the block is destroyed by an explosion. So when I press to choose which block will be placed instead of a block X, the whole MCreator just freezes.
EDIT BY DEVELOPERS:
This bug was fixed. To try if it works, download mcreator.jar from the link provided below and replace mcreator.jar from your installation with the downloaded one. After you do this, run MCreator and try to use the procedure block selection feature. A similar bug was found in overlay and mob creator. Due to many changes required to fix this, we are asking users of any platform to test MCreator with this fixed jar file to see if we broke anything else by fixing this.
Download link to fixed mcreator.jar 1.7.9: http://www.mediafire.com/file/7steqcjrfzsm00a/mcreator.jar
Please note that this mcreator.jar is covered by our TOS as any other MCreator file.