Some blocks in some of my especially big games don't execute their commands, and it is not a problem with my programming.
The blocks that do this are ones that are at the start of a series of blocks, like When Flag Clicked and When I Start As Clone
The problem occurs more frequently when using When I Start as Clone blocks.
It is not fixable without deleting all of the blocks in the affected stack and re-making the stack.
I cannot determine beforehand if the stack of blocks is going to glitch, so it is quite a problem, and very annoying.

Could you post a link to the projects (make sure they're shared) and tell us the sprites and scripts to look at?

MegaDrats wrote:

Some blocks in some of my especially big games don't execute their commands, and it is not a problem with my programming.
The blocks that do this are ones that are at the start of a series of blocks, like When Flag Clicked and When I Start As Clone
The problem occurs more frequently when using When I Start as Clone blocks.
It is not fixable without deleting all of the blocks in the affected stack and re-making the stack.
I cannot determine beforehand if the stack of blocks is going to glitch, so it is quite a problem, and very annoying.

please specify projects where this instance occurs