K2 has a bug in not rendering column properly in Sub Categories. If only one subcategory is created it wont flush to the full width of the page.

edit this (line 220)

<div class="subCategoryContainer<?php echo $lastContainer; ?>"<?php echo (count($this->subCategories)==1) ? '' : ' style="width:'.number_format(100/$this->params->get('subCatColumns'), 1).'%;"'; ?>>

replace with this (line 220)
<div class="subCategoryContainer<?php echo $lastContainer; ?>"<?php echo ' style="width:'.number_format(100/$this->params->get('subCatColumns'), 1).'%;"'; ?>>
Subcategory columns now work properly

WoW! Great detective work and may the K2 fix become permanent. Hear that K2? Update the next release please.

Hello! Now, with the above code, you are talking about using this in the k2.css ?

This is all a struggle for me to learn, and am tempted as a newbie to just give up on K2. I think K2 is a great product with great potential, but maybe not for noobs and not out of the box for sure.

Thanks, Jennifer

This small added code snippet is now in K2 version 2.4.1 in the \components\comK2\templates\default\category.php file at line 89.

The added code snippet in the new code was:
echo (count($this->subCategories)==1) ? '' : '

Thanks, Arnold! I did update to 2.4.1 so won't mess with that! I appreciate your help.

Arnold Thompson said:This small added code snippet is now in K2 version 2.4.1 in the \components\comK2\templates\default\category.php file at line 89.The added code snippet in the new code was:echo (count($this->subCategories)==1) ? '' : '

Hey sorry I forgot to update you i was working on my custom category.php sorry hence the wrong line code.

Line 89 is the right line.

Can anyone confirm the code was fixed in 2.4.1?

I still had to input my code fix to get it right, even from the default category.php

The width 100% code doesn't apply to single subcategories only on two or more.