Gallery - Image Effect

I understand, I can change its appearance (effect under) manually without Image effect CK Pro, but it doesn't work with the latest version of Mediabox CK pro and I will not change it myself.

I see, there is a rendering problem because of the css conflicts between mediabox and image effect
you can try add this css code in your page to fix it
this is a particular situation because mediabox adds some dimensions on the link itself and the caption is then hidden
Let me know if this works for you now, else give me the url of the page. I have to find a better way to fix this issue but I will need some time to do it properly

look at this :
PBCK - single image CSS Class : effectck-under ( works very well with no problems. Without adding yours css code
PBCK -Images gallery CSS Class : effectck-under works very well with no problems.

Mediabox CK Pro 2.6.1

CSS Class : effectck-under shows nothing, even after adding yours css code

I see, you are using the flexible width for the gallery, so you can use this code and remove the other one :

Now it works Thank you .When this 'under' effect will be available for editing in IImage Effect CK pro

When this 'under' effect will be available for editing in IImage Effect CK pro

is that a question ? this is already working in the 2.3.6