After updating from version 3.0 to 3.1 we've got problems with custom styles in FCKEditor (described here http://www.kentico.com/docs/devguide/defining_styles.htm).

Custom styles based on a paragraph "p" won't work anymore:
<Style name="Highlight" element="p">
<Attribute name="class" value="highlighting" />
</Style>

But a custom style based on "span" is working well:
<Style name="Colored" element="span">
<Attribute name="class" value="getcolor" />
</Style>

Could anybody help?