Code was not placing the hidden nonce in the settings form.
In short, move the wp_nonce_field() call into the $content variable assignment.
Patch is below:
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< if (function_exists('wp_nonce_field'))
< wp_nonce_field('slideshare-updatesettings');
<
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< $content = '<form action="" method="post" id="slideshare-conf">'.$this->form_table($rows).'<div class
="submit"><input type="submit" class="button-primary" name="submit" value="'.__("Update SlideShare Settings").' »" /></div></form>';
---
> $content = '<form action="" method="post" id="slideshare-conf">'.$this->form_table($rows).'<div class
="submit"><input type="submit" class="button-primary" name="submit" value="'.__("Update SlideShare Settings").' »" /></div>'.(function_exists('wp_nonce
_field')? wp_nonce_field('slideshare-updatesettings') : '').'</form>';
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< ?>
\ No newline at end of file
---
> ?>