follow on to above..
when investigating the html code generated for the ‘advanced’ write mode and the ‘edit’ mode
I find that the code to display the category selection tree is actually present in all the pages:
<fieldset id="categorydiv">
<legend>Categories</legend>
<div><label for="category-1" class="selectit"><input value="1" type="checkbox" name="post_category[]" id="category-1" checked="checked"/> General</label>
<label for="category-2" class="selectit"><input value="2" type="checkbox" name="post_category[]" id="category-2"/> second category</label>
</div>
</fieldset>
but only displays on the ‘write’ page when set to ‘simple’.
I can see no difference in the html for those pages yet only one displays in my browser (IE6) , the others don’t.
If I put the code in a text editor locally and then view it with the same browser the category selection tick boxes appear in all cases (but obviously without css formatting). curious.