Blank white page, fatal error after 16.0.9 to 16.0.14 upgrade

[lepusa]

After upgrading the following site from 16.0.9 to 16.0.14, I get the errors shown below:
 
http://lep4u.com/joomla/store/
 

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Fatal error: Uncaught --> Smarty Compiler: Syntax error in template "/home/content/xxxxx/html/joomla/store/themes/default-bootstrap/product-list.tpl" on line 138 "<a class="button ajax_add_to_cart_button btn btn-default" href="../../prestashop/themes/default-bootstrap/{$link->getPageLink('cart',false, NULL, "add=1&id_product={$product.id_product|intval}&token={$static_token}", false)|escape:'html':'UTF-8'}" rel="nofollow" title="{l s='Add to cart'}" data-id-product="{$product.id_product|intval}">" - Unexpected "&" <-- thrown in /home/content/xxxxx/html/joomla/store/tools/smarty/sysplugins/smarty_internal_templatecompilerbase.php on line 138
 

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By the way, a week or so prior I had tweaked the file referenced above (/themes/default-bootstrap/product-list.tpl) as mentioned in this post in order to show more characters in product names. The change did not have the desired effect of showing longer names, but it did not break the site either, it kept working fine with the shorter names for several days. Besides, that change has nothing to do with line 138, so I don't think it's related. In any case, I tried replacing "/themes/default-bootstrap/product-list.tpl" with an original version of the file from a backup, but that didn't fix it either.

 

What next?

 

Thanks in advance!

Edited April 9, 2015 by lepusa (see edit history)

[lepusa]

I have tried rolling back to the last install (v16.0.9), but the error still exists.

 

What else I have tried:

 

• Smarty is set to "Never recompile template files, and Cache is set to "No"

• Debug mode is set to "Yes" (Disable all non-PrestaShop modules and overrides)

• Optional Features set to "No"

• CCC all set to "No"

• Ciphering Algorithm I have tried both

• Caching set to "No"

• I have cleared cache repeatedly using the button in the upper green bar

 

Any other ideas?

Edited April 9, 2015 by lepusa (see edit history)