I just installed OrangeHRM ver 18.104.22.168 on my webserver (versions below) and everything went swimmingly. I'm able to login and the menu's display properly, however nothing appears in the content iframe when i select a menu option. NOTE: there is no error message, it's just blank.
If I open the iframe in a new tab or window, again nothing shows up. I've verfified it's not a firewall or browser issue (three major browsers, 2 versions of each). I'm wondering what might cause this issue from a permissions setting or something else server side.
I also have restarted apache as this was a solution for an older version but this didnt work either. (old topic: viewtopic.php?f=12&t=2951&p=4930&hilit=iframe#p4712)
I also verified that the iframe call is the same path as in the demo.
Red Hat Enterprise Linux Server release 5.4 (Tikanga)
I was actually able to solve my problem:
Increased script memory limit
increased script execution time
Hope this can help someone in the future.