Hi Giulia,
I could not replicate this issue locally. Therefore, we need to investigate this on your site.
Some questions:
1. Do you have any other stackideas components installed on the site? eg Komento, EasySocial etc.
2. At the broken layout page, can you view the pagesource, save and attach it here so I can examine it?
3. At the broken layout page, is there a post that is different/stand out from the rest? eg, displaying comments.
4. Is it possible for you to upload the site live so we can investigate this much quicker and efficiently?

Hello
I know it is difficult to reproduce the issue, below my answers hoping it helps:

1. no, only EasyBlog
2. Regarding the blank page, page source is empty. Regarding the category blog list page ,I have enclosed the source code.
3. No they are exactly the same
4. No, at moment

Let me know if you have any idea

Hey Giulia,
In the page source, the page seems to stop and end at this post.
pcvue-to-present-proximity-based-contextual-mobility-for-scada-at-remote-monitoring-control-2015

Can you check this post out and make sure everything is fine? Example post cover, image, etc. Try to unpublish it too and see if it solves the broken page issue.
As for the blank page, I do not have any ideas at all without investigating the site. Maybe you can try setting error reporting to maximum and see if there's any errors.

I have un-published this post and everything works (blank page issue too)
Strange it seems similar to the others.

I will try to re-write it

Thank you for your help

Hey Giulia,

You are most welcome. Glad to hear that your issue has been resolved now.

As a gentle reminder, kindly start a new thread if you have any other issue in the future so it will be easier for us to manage your inquiry. I will lock and mark this thread as resolved.