No I'm on 2.5.4

Sure I'll give that a try.

I am having this problem again... Updated from 2.5.4 to 2.7 to see if it would work, however still not getting thumbnails when uploading new media, nor with existing media. The only thumbnails I have are quite old so approx the first 4 pages of 9 of assets.

Yes it's the same site.

To clarify: resizing isn't working. Here is the template code :

<perch:repeater id="slider" label="Portfolio images">
<perch:before>

            <div id="carousel" class="flexslider">
                  <ul class="slides">
</perch:before>

                    <li class="carousel-item">
                      <img src="

                      <perch:content id="slider-image" type="image" output="path" width="100" height="100" crop="true"/>

                      " class="carousel-picker" title="

                      <perch:content id="slider-description" type="text" label="Slider Description" required="false"/>
                      ">

                    </li>

                <perch:content id="slider-image" type="image" output="path" width="800" height="600" crop="true" suppress="true"/>
                <perch:content id="slider-image" type="image" width="1200" height="600" crop="true" suppress="true" />


<perch:after>   
                  </ul>
                </div>

</perch:after>

</perch:repeater>

Plus thumbnails aren't being generated on upload to assets

Update:

Locally, my new image uploads generate resized versions, and new media gets a thumbnail.

Remotely the problems are ocurring.

Remote Perch diagnostics:

Perch is up to date PHP 5.4.4-14+deb7u9 version is okay, but a little out of date. Consider updating soon. MySQL 5.5.37-0+wheezy1 is up to date Image processing available SUMMARY INFORMATION

Perch: 2.7, PHP: 5.4.4-14+deb7u9, MySQL: 5.5.37, with PDO Server OS: Linux, apache2handler Installed apps: content (2.7), assets (2.7), categories (2.7), perch_blog (4.1), perch_forms (1.7) App runtimes: <?php $apps_list = array( 'content', 'perch_forms', 'perch_blog', 'categories' ); PERCH_LOGINPATH: /perch PERCH_PATH: /home/adammench/public/menczykowski.co.uk/stanmore/perch PERCH_CORE: /home/adammench/public/menczykowski.co.uk/stanmore/perch/core PERCH_RESFILEPATH: /home/adammench/public/menczykowski.co.uk/stanmore/perch/resources Image manipulation: GD PHP limits: Max upload 10M, Max POST 8M, Memory: 128M, Total max file upload: 8M Resource folder writeable: Yes HTTP_HOST: stanmore.menczykowski.co.uk DOCUMENT_ROOT: /home/adammench/public/menczykowski.co.uk/stanmore/ REQUEST_URI: /perch/core/settings/diagnostics/ SCRIPT_NAME: /perch/core/settings/diagnostics/index.php