cannot edit pages and more

Hope anyone can help.

I am translating our website using qtranslate. It worked perfect last week and already translated half of the pages.(the pages where originally build with a page builder, I am now recreating them in html and then adding the translating)

This worked fine (although a lot of extra work).

But now,…

When I click on ‘new page’- the page is not new (and empty), it is filled with content. It takes a few attempts to remove this, but ok. Then I want to add content in the designated field, but when I click on update, the new content disappears! The strangest is that I can add devider, but I cannot add tekst or collumns.

Even better would be to edit the pages like I did last week, but that causes even more complicated issues that I believe will probably be fixed once I am again able to add and edit new pages.

What I have tried to solve this:

I have deactivated all plugins, this did not solve anything. So reactivated them again (all are up to date)
I tried a different browser (no idea why I thought that might work)

Anyone have an idea on how to fix this?