Thanks! I will try the svBuilder option as well. But right now all I need to do is temporarily disable the Security plugin, create the gallery and them reactivate it back.
Thanks,
Luis

I found the problem. I deactivated "WP Security Scan" plugin and it worked.
Now I have to figure out why...
Luis

Hi Steven,
I have created several galleries before using previous versions. They still work fine.
Is just the button that doesn't do anything. Is there a way to check what is it doing? Any source code...? I tried to check the error console in the browser but nothing appears.
I have several plugins installed and I am using a custom theme. I don't want to revert to a standard theme nor I can disable any plugin. I am running a production website and I can't "test" things on the fly.
Isn't there any other way of chasing the problem?
Is there any other way of publishing the gallery since everything works after the shortcode is placed?
Thanks,
Luis

As a side note: I also have another wordpress site in the same server running WP-SimpleViewer 2.3.0. It works perfectly fine. The only difference is that wordpress version is still 3.2.1.
Luis

I recently upgraded to version 2.3.0.
I tried to create a new gallery but the "Add Gallery" button doesn't work in any browser I tried.
I deleted everything, uploaded the plugin again and still doesn't work.
Checked the requirements and everything checks ok. I am using Wordpress 3.3.1 and no incompatible plugins. My upload folder has 777 permissions.
Can anyone help?
Thanks,
Luis