When on a category page viewing all of the subcategories, the images do not line up with the titles below them. I am not sure if a fix has been posted yet so here is the fix that works for me.
You will need to modify the following file "public_html --> storefront --> view --> default_html5 --> template --> pages --> product --> category.tpl"
Lines 15-26 of the original category.tpl file should read as follows:
<ul class="thumbnails row">
<?php for ($i = 0; $i < sizeof($categories); $i++) { ?>
<li class="span2">
<a href="<?php echo $categories[ $i ][ 'href' ]; ?>">
<?php echo $categories[ $i ][ 'thumb' ][ 'thumb_html' ]; ?>
</a>
<div class="span2">
<a href="<?php echo $categories[ $i ][ 'href' ]; ?>"><?php echo $categories[ $i ][ 'name' ]; ?></a>
</div>
</li>
<?php } ?>
</ul>
Replace these lines with the following code:
<ul class="thumbnails row">
<?php for ($i = 0; $i < sizeof($categories); $i++) { ?>
<li class="span2">
<center><a href="<?php echo $categories[ $i ][ 'href' ]; ?>">
<?php echo $categories[ $i ][ 'thumb' ][ 'thumb_html' ]; ?>
</a></center>
<center><div style="text-align:center;">
<a href="<?php echo $categories[ $i ][ 'href' ]; ?>"><?php echo $categories[ $i ][ 'name' ]; ?></a>
</div></center>
</li>
<?php } ?>
</ul>
All changes have been marked with the color red if you want to just add the fix I used instead of replacing the entire code snippet.