there is a problem with .png files in the gallery. .png files will not display.
There is a other problem with more than one galeries. When i create some portfolio galery items and go to the frontend there have a long loading time or crash the browser …
The issues you are talking about haven’t been reported before – please send me your website’s URL with admin login/password to email@example.com, along with the description of the exact places where the errors occur. Thanks!
after examining your website with a speed test tool (results here, scroll down the page for a breakdown by individual files), I can recommend optimizing the images that make up the gallery slides in order to reduce their size (e.g. downsampling or – preferrable – converting into jpg and reuploading), since the page is quite large in size (8.3 MB, compared to e.g. Ikebana theme demo, which is only 3.8 MB), and several images are almost 1 MB in size each (e.g. this one and this one).