Do me a favor and download the attached zip I want you to see how I do it using TransparentAPI by just putting one frame on top of the other. This is not a gif animation program it is just a demonstrating of the 6 frames where I put one on top of the other. Run the project and click on each button one at a time and look at the results on the first picture. This is what I thought you were doing similar to this but using your own code. Notice how the transparent color is red which is the correct transparent color for this gif file. You are not using the transparent color as the backColor for the picture but you are using the index to the transparent color which wont work in other cases - you are just lucky on this one that the index value was 0 which gives you a black background color which worked for your halloween picture becaue it is on a black background but that is not what you want, you want the real transparent color which is red like I have.
I think your method in the aniMod is a little confusing although I see what you are doing I think it's more than you need to do. My demo illustrates how it should be done for the halloween gif because it is emulating the Leave method exactly. If you were to put my demo in a timing loop using the correct timing values for each frame you will see how simple the Leave method really is.
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