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@danmschell, CTRL - or CTRL 0

@rhf, the easy and safe way is to create a template for galleries pages, I’ve tried it just for you and it works well.
This is if you have the gallery linked to a page.
Add in that template, just before the content, a thing like this:

<div id="backtoalbum">
<a id="return" href="http://mysite.com/albumpage/"><?php print "<< Back to Album" ?></a>
</div>

The div and the ids are for assign a style with CSS if you want to, and of course you can change any terms as you want. Remember to assign the template to that page.
If you don’t have the gallery linked to a page, follow the instructions at the second link in my previous post.
Put in that template that same code, after <?php if (!defined ('ABSPATH')) die ('No direct access allowed'); ?><?php if (!empty ($gallery)) : ?>
Then in Gallery settings > basic thumbnails > template, paste the name of your template and save.

@erodegrigo post a link to a page where the issue is visible.

@lovesujeiry OK now I see it, sorry you mentioned slideshow and gallery and I hadn’t noticed that you have an image-browser display type in that page.
You can check if it is an issue with your current theme or another plugin by temporarily switching to a default WordPress Twenty series theme and deactivating all plugins.

@rhf, here you can find documentation about conditional tags, and here some hints to create page templates (but if you link the gallery to a page and you have a particular template for that page, you don’t need conditional tags).

@danmschell, That URL is not resolving.

@alex75bo, @cais ti ha solo suggerito che dalla lista dei sospetti secondo lui puoi togliere Akismet e Google XML Sitemaps, rispondendo alla tua domanda. Davvero non capisco come puoi aver tratto quella conclusione. E, soprattutto, non si parla di disinstallare, ma solo di disattivare momentaneamente tutti i plugin: è il procedimento normale per testare conflitti, comprende anche l’attivazione di un tema di default di WordPress. Quando saranno tutti disattivati, li riattivi uno ad uno ogni volta facendo i controlli opportuni, fino a che non trovi l’eventuale colpevole.

@cais has simply answered your question by suggesting that those two plugins usually does not fall within a list of suspects.
And you don’t need to uninstall, just temporarily disable all plugins: a common procedure to test conflicts that also includes the activation of a default WordPress theme. When they are all disabled, re-enable them one by one, each time checking until you find the possible culprit.