When you edit a post, special characters are replaced with HTML entities. These are not re-parsed when you save the edit. So for example, say I post this: [quote]"I am a test. 'A test,' I say!"[/quote] When I go to edit it, I will see the following in the textbox: [quote]"I am a test. 'A test,' I say!"[/quote] And the post will display like that when I save it. If I then go to edit it again, the problem stacks: [quote]"I am a test. 'A test,' I say!"[/quote]