I thought I answered it
store is stock, has no custom apps,
Zen Cart has been online functional for at least 3 years, no real changes made.
Problem seems to start when updated from 1.3.8 to 1,39d
when clicking on Who's Online the host server reports
[24-Jul-2010 23:20:16] PHP Fatal error: Maximum execution time of 60 seconds exceeded in /home1/teamzron/public_html/fstore/tzadmin/whos_online.php on line 416
[24-Jul-2010 23:34:27] PHP Fatal error: Maximum execution time of 60 seconds exceeded in /home1/teamzron/public_html/fstore/tzadmin/whos_online.php on line 409
[24-Jul-2010 23:34:31] PHP Fatal error: Maximum execution time of 60 seconds exceeded in /home1/teamzron/public_html/fstore/tzadmin/whos_online.php on line 410
[24-Jul-2010 23:34:33] PHP Fatal error: Maximum execution time of 60 seconds exceeded in /home1/teamzron/public_html/fstore/tzadmin/whos_online.php on line 416
[24-Jul-2010 23:40:52] PHP Fatal error: Maximum execution time of 60 seconds exceeded in /home1/teamzron/public_html/fstore/tzadmin/whos_online.php on line 410
Who's online webpage never loads even if clicking on who's online via tools multi times
Host is Hostmonster
Again software has not been modified and seems issue started after being updated to V 1.39d and I noticed problem started just after update was done
Via phpAdmin database Zc1 was repaired and optimized by hostmonster tech support, did not fix the probolem