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I just ran into this bug:
https://support.ellislab.com/bugs/detail/17853

I have been testing my site with the following code:

{exp:channel:categories category_group="3" show="61"}
     <h1>TEST</h1>
{/exp:channel:categories}

In this example I have 3 sub categories, IDs 61, 62, 63, 340. If I use the code above I get no results, but if I change the show param to:

show="61|62|63|340"

it works, but of course outputs “TEST” four times which isn’t the desired result.

These three categories are child categories of category 62

Sorry, I just saw this note in the documentation which may explain the behavior:

“Note: If you specify that a parent category is not shown, then any children of that parent category are then unable to be shown by the tag. The parent category is required for any and all children categories.”

Hello Adam,

I am glad you were able to find the solution.

If you need anything else, please just let me know by opening a new thread.

Cheers,