I installed new system.
and make new map, add items. works fine.

update my system (yum -y upgrade)

add item to map... did not display icon.

httpd/error_log
[error] [client 10.1.88.1] PHP Fatal error: imagecreatefromstring() [<a href='function.imagecreatefromstring'>function.imagecreatefromstring</a>]: gd-png: fatal libpng error: Read Error: truncated data in /usr/local/share/zabbix/imgstore.php on line 52, referer: http://10.1.88.18/zabbix/sysmap.php?sysmapid=2&sid=66755934705a89a0

--------

so I edit imgstore.php on line 52

• $ico = imagecreatefromstring($image['image']);
  + $ico = imagecreatefrompng('images/sysmaps/'.$image['name'].'.png');

---------