This is in fact a bug. It only fails when run after all other kernels. If run standalone or as one of the first few it runs just fine and displays original, test, and comparison images.

If I run the gaussianBlur test on its own it passes. If I run it as the 1st, 2nd, 3rd, or 4th test it passes. It only fails when i run the whole suite of kernels in a loop. I have a feeling this is related to the Max Buffer reached issue.

I do not have any stately variables in my code and would be happy to provide it for testing purposes.

I ran in to the same thing. It looks like there is a limit to the amount of data codewars will let you write to the console.