i reinstalled Apache and overwrite the PHP install folder. but the problem still there.
i also noted that after i log into PMA a small message at the bottom appeared:
The additional features for working with linked tables have been deactivated. To find out why click here.
i open the link and it showed:
Server: localhost
$cfg['Servers'][$i]['pmadb'] ... not OK [ Documentation ]
$cfg['Servers'][$i]['relation'] ... not OK [ Documentation ]
General relation features: Disabled
$cfg['Servers'][$i]['table_info'] ... not OK [ Documentation ]
Display Features: Disabled
$cfg['Servers'][$i]['table_coords'] ... not OK [ Documentation ]
$cfg['Servers'][$i]['pdf_pages'] ... not OK [ Documentation ]
Creation of PDFs: Disabled
$cfg['Servers'][$i]['column_info'] ... not OK [ Documentation ]
Displaying Column Comments: Disabled
Browser transformation: Disabled
$cfg['Servers'][$i]['bookmarktable'] ... not OK [ Documentation ]
Bookmarked SQL query: Disabled
$cfg['Servers'][$i]['history'] ... not OK [ Documentation ]
SQL history: Disabled
$cfg['Servers'][$i]['designer_coords'] ... not OK [ Documentation ]
Designer: Disabled
should this concern me?