Image gallery problem

My image gallery in product page is working fine, but when i change size for a product, gallery is messed up.

masina-shop.co.rs/index.php/product/show/261-cocaine

That's because you modified the CSS of the image generation code only for the main variant in the show file of the view product. You should also do them in the variants block of code near the middle of the file.

I have fixed thumb display, but now i have another problem.

I used code from this thread www.hikashop.com/en/support/forum/4-how-...n-product-image.html to hide first thumb and replace it with second thumb. That is working fine, but when i change variant, the first thumb comes back again.

I also tried this code but that doesn't help.

For the variants, you need to add the line:
$variant->images = array_shift($variant->images);

after the line:
foreach($this->element->variants as $variant){

You should use
array_shift($variant->images);
and not
$variant->images = array_shift($variant->images);

Now i started adding some variants to my products, but variants wont update. I found that the problem is modifications that i made in the show file.

This is the code that is causing problem:
array_shift($variant->images);

When i delete this line variations are displaying fine.

Is there a way to fix this.

Thanks

I don't know. That modification shouldn't produce any error. Are you sure that you didn't modify something else in the file ?
Do you have two images for your products/variants ?