Okay, I understand the issue now!! The plugin works perfectly AS LONG AS 4 columns with faces only are used. If there are fewer columns, there will be a 'blink' while looking for the fourth column. Also, I conducted a test and added a fifth column, and it was not taken into account either.
Therefore, the plugin works. It was an issue with the image. I checked the tutorial and didn't find any part specifying that the images had to be of 4 columns (the tutorial example was with 4 columns, but I didn't know it had to be strictly like that). So, perhaps the suggestion would be to update the plugin and include a warning stating that images must meet certain criteria: have 4 columns, neither less nor more. Also, add this information to the tutorial =)
If what I'm saying is already specified somewhere and I missed it, I apologize for the inconvenience :P
Taking this into account, I am now able to implement the plugin in my project, and it looks great... so thank you for everything once again =)Let me know if you think it's better to delete these messages to avoid confusing those who might buy it in the future, or if it's better to leave them so that they can read in case they encounter the same issue ;)