You're right, it was an upgrade. Making the changes above, I now get:

Parse error: syntax error, unexpected $end in /home/xxxxxx/ohwowthatscool.com/myadmin/display_logs.php on line 309

You were also right, the defines for my logs directory was missing in the configure files. I added:

define('DIR_FS_LOGS', DIR_FS_LOGS . 'logs/');

to both configures, but I'm still getting the error from line 309. For the heck of it, I went back to your orignal code on display_logs.php since I added the define statements, and I'm back to getting the 500 error.

Thank you for trying to help.