Serges

What do you mean by “hackable”?
Here is a topic https://www.ads-software.com/support/topic/all-my-posts-were-changed-name-and-content-with-watch-online-movies/ with the problem, which reminds “hacking” a little.
You will also find there and article about “I am being hacked”.

You need to note, that some themes support sidebar disabling. There is a lot of FAQ in the WordPress about it.
https://www.ads-software.com/themes/spacious/ (has no-sidebar layout)
https://www.ads-software.com/themes/full-frame/
https://www.ads-software.com/themes/rokophoto-lite/
https://www.ads-software.com/themes/brigsby/

There can be a conflict with other plugin also. Try to leave on your staging site both Jetpack and Calender enabled and start to disable other plugins one by one. And maybe you will find which plugin is in conflict with two of yours.
Also I faced a problem when I thought that two plugins were in the conflict, but it appeared that the problem was in a theme. So, try to use standard theme also.
When you troubleshoot this issue more detailed, you can write to the Jetpack support and describe them your problem.

Do you use RSS? Probably that’s why you see /feed/ in the end of the address.
Check this article https://en.support.wordpress.com/feeds/, perhaps it will be useful.
It looks like if you use RSS, you can’t disable /feed, but I am not sure about it.

• This reply was modified 7 years, 6 months ago by Serges.

You can use Supsystic Gallery and their Mosaic Template https://www.ads-software.com/plugins/gallery-by-supsystic/
It shows the gallery exactly like you want.

Hmm, you can use Supsystic Contact Form https://www.ads-software.com/plugins/contact-form-by-supsystic/ and you will be able to enable redirect after successful form submitting without any scripts.

You need all the functionality in one plugin/theme or you will use several items in order to achieve it?

So you want to share the post, but not in all social networks?
You can use Supsystic Social Share plugin https://www.ads-software.com/plugins/social-share-buttons-by-supsystic/ and create several sharing buttons.

• This reply was modified 7 years, 6 months ago by Serges.

Or you can do vise-versa. Leave your plugins enabled and disable them one by one. And try to add post after each disabling.

Using Supsystic gallery you can allow users roles to create and edit galleries from back-end https://www.ads-software.com/plugins/gallery-by-supsystic/
Creating a lot of galleries and placing them on various pages also included.

Maybe the problem is also in PopUp? You can try different plugins.