Problem using wysiwyg editor and CI

[eluser]The Dooode[/eluser]
I am having a wierd problem using wysiwyg editors in my Code Igniter applications. When saving the content from the editor it sometimes does not get posted so that I loose all the content in the editor. It seems to only happy once the amount of content goes over a certain size - a couple of paragraphs and an image normally causes it to be lost. If it's just a paragraph then it all works fine.

I have other applications that don't use Code Igniter and they work fine so it does seem to be an issue with CI rather than a PHP/Apache config thing? I have tried both wysiwyg pro and Tiny MCE and get the same problem.

Has anyone encountered this before? Any thoughts on why this happens?