1. How to delete smarty cache?

Prestashop is caching *.tpl files, so after any change, you need to delete cache to apply these changes.

Prestashop 1.4

A) You can delete cache by deleting all files in /tools/smarty/compile/


B) In Prestashop administration (Preferences > Image): Turn off caching and turn on force compile in BO > Preferences > Performance and then just reload the page. Make sure to setup it back after reloading page, it is important for performance.


Prestashop 1.5

Prestashop 1.5 already recompiles template files automatically (with default setup). You can also clear the cache manually via administration. Go to Advanced parameters > Performance and click on "Clear Smarty cache & Autoload cache".


2. Issues with displaying page in Internet Explorer

Prestashop 1.5

Internet Explorer browser may cause issues due to the limit of maximum external cascading style sheets, which is set to 30. This is an issue for modular web applications like Prestashop, where the stylesheets of modules are stored separately. Some templates may reach this limit. We recommend the following setup that solves the issue and also improves the overall site performance. Go to Advanced Parameters > Performance > CCC (Combine, Compress and Cache) and set "Use CCC for CSS" and "Use CCC for JavaScript". Keep the other settings as it is. 


3. Enable debug mode

Prestashop 1.4 - 1.5.2

edit config/config.inc.php and change these two lines to be as follow:

/* Debug only */
@ini_set('display_errors', 'on');
define('_PS_DEBUG_SQL_', true);

Prestashop since 1.5.3

edit config/defines.inc.php
/* Debug only */
define('_PS_MODE_DEV_', true);


4. How to change logo to png format

Prestashop 1.5

Go to Preferences > Images and setup > Image quality > setup "Use PNG only if the base image is in PNG format".

Then you can upload your logo in PNG format.