Blog Post Image not creating thumb size for list

Hi,

I've just resisted a blog post and the image used, but the image is now too big in the list view. In other words, in the post itself the image is fine, but when viewing a list of posts where there used to be a 100 x 100 thumb image, it's now too big and hasn't cropped.

The post template is:

<article class="h-entry">
    <h1>
        <a href="<perch:blog id="postURL" type="hidden" />" rel="bookmark" class="p-name">
            <perch:blog id="postTitle" type="text" label="Title" required="true" size="xl autowidth" order="1" />
        </a>
    </h1>

    <p class="meta">
        <time class="dt-published" datetime="<perch:blog id="postDateTime" type="date" label="Date" time="true" format="Y-m-d H:i:s" divider-before="Publishing" />">
            <perch:blog id="postDateTime" type="date" time="true" format="%d %B %Y" /> 
        </time>
        <perch:if exists="authorGivenName">
            by <span class="p-author h-card"><perch:blog id="authorGivenName" type="hidden" /> <perch:blog id="authorFamilyName" type="hidden" /></span>
        </perch:if>    
        <perch:categories id="categories" set="blog" label="Categories" display-as="checkboxes">
            <a href="archive.php?cat=<perch:category id="catSlug" type="slug" />" class="p-category">
                <perch:category id="catTitle" type="text" />
            </a>
        </perch:categories>

    </p>

    <perch:if exists="image">
        <div>
            <img src="<perch:blog id="image" type="image" width="320" height="240" crop="true" label="Image" order="4" />" alt="<perch:blog id="postTitle" />" />
        </div>
    </perch:if>
    <div class="description e-content">
        <perch:blog id="postDescHTML" type="textarea" label="Post" order="2" editor="markitup" markdown="true" size="xxl autowidth" required="true" />
    </div>

    <perch:if exists="latin">
    <p style="font-style:italic;"><perch:blog id="latin" type="text" label="Latin Name (if plant entry)"  order="2" /></p>
    </perch:if>

    <perch:if exists="plantHistoric">
    <div>
        <h5 style="margin-bottom:0px; font-size:15px;"><strong>Historic:</strong></h5> <perch:blog id="plantHistoric"  type="textarea"  editor="markitup" label="Historic (if plant entry)" encode="false" textile="true" />
    </div>
    </perch:if>

    <perch:if exists="plantRecipe">
    <div>
        <h5 style="margin-bottom:0px; font-size:15px;"><strong>Recipe:</strong></h5>
        <perch:blog id="plantRecipe" type="textarea"  editor="markitup" label="Recipe (if plant entry)" encode="false" textile="true" />
    </div>
    </perch:if>

</article>

<perch:blog id="excerpt" type="textarea" label="Excerpt" markdown="true" order="3" suppress="true" size="s" />
<perch:blog id="image" type="image" width="100" height="100" crop="true" suppress="true" />

and the post_in_list template is:

<perch:before>
<ul class="hfeed listing"></perch:before>
    <li class="hentry">
        <h2><a href="<perch:blog id="postURL" />" rel="bookmark" class="entry-title"><perch:blog id="postTitle" /></a></h2>
        <perch:if exists="image"><img  style="float:right;" src="<perch:blog id="image" type="image" width="100" height="100" crop="true" />" alt="<perch:blog id="postTitle" />" /></perch:if>
        <div class="description entry-summary">
        <perch:blog id="excerpt" type="textarea" textile="true" />
        <a href="<perch:blog id="postURL" />" rel="bookmark" class="entry-title">...read more</a>
       <p class="entry-published date"><perch:blog id="postDateTime" format="%d %B %Y" /></p>
        </div>
    </li>
<perch:after>
    </ul>

    <perch:if exists="paging">
        <div class="paging">
            Page <perch:blog id="current_page" /> of <perch:blog id="number_of_pages" />
            <perch:if exists="not_first_page">
                <a href="<perch:blog id="prev_url" encode="false" />">Previous</a>
            </perch:if>
            <perch:if exists="not_last_page">
                <a href="<perch:blog id="next_url" encode="false" />">Next</a>
            </perch:if>
        </div>
    </perch:if>
</perch:after>

My diagnostic is:

SUMMARY INFORMATION

Perch: 2.8.25, PHP: 5.3.28, MySQL: mysqlnd 5.0.8-dev - 20102224 - $Id: 731e5b87ba42146a687c29995d2dfd8b4e40b325 $, with PDO
Server OS: Linux, cgi-fcgi
Installed apps: content (2.8.25), assets (2.8.25), categories (2.8.25), perch_blog (5.0), perch_events (1.7), perch_mailchimp (2.0.1), perch_shop_paypal (1.2.3), perch_plantcats (3.6.1)
App runtimes: <?php include(PERCH_PATH.'/core/apps/content/runtime.php'); include(PERCH_PATH.'/addons/apps/perch_plantcats/runtime.php'); include(PERCH_PATH.'/addons/apps/perch_shop_paypal/runtime.php'); include(PERCH_PATH.'/addons/apps/perch_events/runtime.php'); include(PERCH_PATH.'/addons/apps/perch_blog/runtime.php'); include(PERCH_PATH.'/addons/apps/perch_mailchimp/runtime.php'); ?>
PERCH_LOGINPATH: /admin
PERCH_PATH: /home/sites/cookslaneherbs.co.uk/public_html/admin
PERCH_CORE: /home/sites/cookslaneherbs.co.uk/public_html/admin/core
PERCH_RESFILEPATH: /home/sites/cookslaneherbs.co.uk/public_html/admin/resources
Image manipulation: GD
PHP limits: Max upload 64M, Max POST 64M, Memory: 128M, Total max file upload: 64M
F1: dc1fef2ad0fcd9f943c02ebb43d85dbc
Resource folder writeable: Yes
HTTP_HOST: cookslaneherbs.co.uk
DOCUMENT_ROOT: /home/sites/cookslaneherbs.co.uk/public_html
REQUEST_URI: /admin/core/settings/diagnostics/
SCRIPT_NAME: /admin/core/settings/diagnostics/index.php