Editor Issue

I wonder if anyone can help me.

When I try to write or edit posts I constantly get the same error. Nothing will post and I get the error message:

“Connection lost. Saving has been disabled until you’re reconnected. We’re backing up this post in your browser, just in case.”

I run WordPress on a Plesk VPS on CentOs (updated to latest version). I’ve tried uninstalling all plugins, using a default theme, all the usual. Reading some other forums this appears to be a problem with WordPress interacting with mod_sec in php / apache, but for the life of me I can’t see how to solve it.

Can anyone help?

Thanks,

Peter+

[Moderator Note: No bumping, thank you.]