Anybody experiencing problems with saving changes to landingpages

So I do the changes - can be to JSP calls or just to an html field in the html editor. I see the changes and hits ok for save. But it hasn't saved the changes. 

gets this error (nothing else is going on in the system)

Hits Return to prev..

Closes to not save this edition and goes back into edit:

Where it look like this again:

Hits ok to be sure this edition is saved

It look like it's changed:

Goes back into Edit and this is how it looks:

I don't get it. It's a single server. It doesn't necessary help to restart it. 

Anybody experiencing the same problem or have an idea of what could cause it?