I am having problem exporting my site (blank screen, forbidden error or corrupted ZIP file).

The first thing you'll want to check is the permissions of the following:
- Builder/tmp folder
- Builder/save.php, Builder/iupload.php and Builder/preview.php files

just make sure the web server is able to write to these files (in most cases, 755 will be sufficient, if not try 777 instead).

Next, PHP relies on usage of the "zlib" library so you want to make sure this library is present and active (you can this using a phpinfo() page and doing a quick page search for "zlib").

if you need more help, just submit a private ticket on our support center https://themedept.ticksy.com and send us your website information (url and ftp access).