Hi Laboon, I found two similar issues. All screenshots for issues could be found in this link: https://docs.google.com/document/d/1HIq_ubI4lktfZrJnal0FoXfUygOBYIdqYbzZLS3hGG4/edit?usp=sharing
This is the initialised status for all issues - size = 15
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..X.X...XX..XX.
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ISSUE 1:
DESCRIPTION: When I finish one round of GameOfLife, I has to click twice on the "Clear" button to do the clear operation or jump out of this game firstly and then go back (Clicking other places in the screen and then click back to program window).
SUMMARY: The clear operation can't be completed after clicking "Clear" button only one time.
REPRODUCTION STEPS:

1. Click "Load" to load the backup file mentioned above completely.
2. Click "Run Continuous"
3. Click "Stop" to stop the game once you find the result has no change any more.
4. Click "Clear" to clear the current world
   5_. If you didn't see any strange, repeat step 1 to 4 more than 3 times.
   _EXPECTED BEHAVIOR:* The current world should be totally clear.
   OBSERVED BEHAVIOR: Several cells still remain to be green or red.

ISSUE 2:
DESCRIPTION: When I run GameOfLife more than 3 times continuously, in the beginning of every round, I has to click twice on the "Load" button to load the backup file or jump out of this game firstly and then go back (Clicking other places in the screen and then click back to program window).
SUMMARY: The loading operation can't be completed totally until clicking "Load" button more than once.
REPRODUCTION STEPS:

1. Click "Load" to load the backup file mentioned above completely.
2. Click "Run Continuous"
3. Click "Stop" to stop the game once you find the result has no change any more.
4. Click "Clear" to clear the current world
5. Repeat step 1 to 4 more than 3 times.
6. Click "Load" to do loading again
   EXPECTED BEHAVIOR: The current world should be initialised with backup file.
   OBSERVED BEHAVIOR: Only a part of cells have been initialized.