The Categories conversion script has a few bugs, namely that the generated links point to the Menu Manager conversion script, sometimes doesn't include the "ignore=1" parameter, & it doesn't import the associated images.
Attached is a script ("conversion_patch.txt") that corrects both those problems.
However there is another problem, though. The script completely ignores 3rd-Party module items. To import Article Manager items, I created a function that can be included in the base Convert class, if you like.
This way the conversion process can be made more intuitive. FatCat categories can be converted *before* the category-using modules & each module can easily convert their own item categorizations. The function is attached as ("category_item_conversion_function.txt").
Proposed convertCategories function
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File Added: conversion_patch.txt
Patch to /convert/modules/categories/convert.php
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I have added your patch to svn. Thank you. I am adding the second file in its current text format. Let me know if you want to add more usage information.