The recommended FA server versions for FA v2.3 are PHP 5.3+, MySQL 5 to 5.1 and Apache 2.2.x
The latest version of FA is v2.3.24 with many bugs squashed since your version which was released on 2013-.02-14. The date shown in your install is based on the file creation date of the CHANGELOG.php file.
MS Internet Explorer <= v8.0 is now not supported by FA. Use some of the later versions of FireFox. Chrome has it's quirks and politico-commercial slants.
Does your install have much data?
What CoA (chart) are you using?
Which extensions are you using?
Any customisations?