problem with shortcode exec php plugin

hi
im building a new site and need to use "shortcode exec php" plugin
it works well on the old site for example on this page http://freespirit.org.il/%D7%9E%D7%A9%D7%A4%D7%98%D7%99%D7%9D-%D7%9C%D7%97%D7%A9%D7%99%D7%91%D7%94-%D7%97%D7%99%D7%95%D7%91%D7%99%D7%AA/

but on the new site it does not work even when i use the demo content(hello world) basic shortcode
for example here
http://seo-splash.co.il/nitza/%D7%9E%D7%A9%D7%A4%D7%98%D7%99-%D7%A9%D7%A4%D7%A2/

can you please help me know what is the problem ?