I just ran the patch to move from 2.4.2 -> 2.4.3 and everything is fine except for the Site Settings page...it comes up blank. Working through the forum posts, I discovered I need to check my logs for errors. Found this:
[Fri Dec 20 13:29:20 2013] [error] [client 126.96.36.199] NOTICE: Constant OJS_METRIC_TYPE_COUNTER already defined (/volumes/1TB/htdocs/ojs/plugins/generic/usageStats/UsageStatsReportPlugin.inc.php:19), referer: http://journals.gmu.edu/index/admin
[Fri Dec 20 13:29:20 2013] [error] [client 188.8.131.52] PHP Fatal error: Cannot redeclare class UsageStatsReportPlugin in /volumes/1TB/htdocs/ojs/plugins/generic/usageStats/UsageStatsReportPlugin.inc.php on line 21, referer: http://journals.gmu.edu/index/admin
Not so worried about the NOTICE but the Fatal error in the next line...that's a problem.
Server OS: Mac OSX Server 10.8.5
Things ran fine under 2.4.2 so something about the code change for 2.4.3 introduced this issue.
Later, I went to another machine running OJS 2.3.8 and ran a patch upgrade. When completed, the same symptom/log_error shows up if I hit the "site settings" page.
on that box:
OS platform Darwin
PHP version 5.3.19
Apache version Apache/2.2.22 (Unix) mod_ssl/2.2.22 OpenSSL/1.0.1c DAV/2 PHP/5.3.19 Phusion_Passenger/3.0.19
Database driver mysql
Database server version 5.0.92