Andy,
Please check Editor.BreakElement Property setting.
Editor.BreakElement PropertySpecify the behavior when the "enter" key is pressed in the editor The default is BreakElement.Div.
>> As far as I know, I have changed nothing yet today my blocks are rendered using <p></p> tags whereas before they have always been <div></div> tags?
Can you reproduce the problems here?
http://cutesoft.net/example/oncarriagereturn.aspxKeep me posted
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