This seems to be a strange problem, but maybe there is a simple fix. We moved our website Version 2.3.0 from a staging area to a new dedicated server. After the move a handful of pages are saying "Error Saving Content" when we try to edit the page. Although if I remove certain pieces of content it saves fine. Here is a step by step of how was able to recreate it:
1. Try to save the content that was ported over and it gives the error.
2. Remove the word "Updates" and the content saves without erroring.
3. Put a different word in with the same amount of characters and it saves fine.
It's going to be very time consuming going though each page to find the actual problems in the content. Has anyone seen this before?
Put the site into devmode by adding Director::set_environment_type("dev"); in your _config file and then install firebug for firefox.
Then open up firebug, go to the console tab and enable it (You'll probably have to reload the browser) then next time you save you should see the error in the console window. If devmode has been configured - which is has if you did step 1 then you should see the full blown error message which will help track the underlying issue down.