I was using stylesheet spans on Version 5.3.2 very successful.
No - after entering (copying) my html code and using the html-viewer to show the content the style-information still work. But after saving, all css information has been deleted.
Did you implement a "cleaning" procedure to prevent unregular code and my CSS information is now "unregular"?
Problem seems to have started while migrating from 5.3.2 to 5.4! You have the fck Editor integrated in the rollout package, so you should know, if you have updated the version of fck editor as well.
How do can I make a rollback for the fck editor only?