I have just loaded 5.1.1.1 and can confirm mediainfo is successfully loaded and my Music files are now being recognised on the PS3. Many thanks for the timely update.
DEBUG 07:15:12.653 [main] Tue Apr 07 07:15:12 NZST 2015
DEBUG 07:15:12.654 [main] Reading cred.path: "C:\ProgramData\UMS\UMS.cred" (default: "")
DEBUG 07:15:13.054 [main] PID: 4676
DEBUG 07:15:13.058 [main]
INFO 07:15:13.058 [main] Starting Universal Media Server 5.1.1.1
INFO 07:15:13.058 [main] Based on PS3 Media Server by shagrath, copyright 2008-2014
INFO 07:15:13.058 [main]
http://www.universalmediaserver.com
INFO 07:15:13.059 [main]
INFO 07:15:13.059 [main] Build: a00ebf2a5 (2015-04-02)
INFO 07:15:13.059 [main] Java: Java HotSpot(TM) Client VM 1.8.0_31 32-bit by Oracle Corporation
INFO 07:15:13.059 [main] OS: Windows 8.1 64-bit 6.3
INFO 07:15:13.059 [main] Encoding: UTF-8
INFO 07:15:13.062 [main] Memory: 742 MB
INFO 07:15:13.062 [main] Language: en
INFO 07:15:13.062 [main]
INFO 07:15:13.062 [main] Working directory: C:\Program Files (x86)\Universal Media Server
INFO 07:15:13.064 [main] Temp directory: C:\Users\Office\AppData\Local\Temp\universalmediaserver
INFO 07:15:13.066 [main] Logging config file: C:\Program Files (x86)\Universal Media Server\logback.xml
INFO 07:15:13.066 [main] debug.log: C:\ProgramData\UMS\debug.log
INFO 07:15:13.066 [main]
INFO 07:15:13.066 [main] Profile directory: C:\ProgramData\UMS
INFO 07:15:13.068 [main] Profile directory permissions: rw
INFO 07:15:13.068 [main] Profile path: C:\ProgramData\UMS\UMS.conf
INFO 07:15:13.069 [main] Profile permissions: rw
INFO 07:15:13.070 [main] Profile name: Office-PC
INFO 07:15:13.070 [main]
DEBUG 07:15:13.070 [main] Reading web_conf: "C:\ProgramData\UMS\WEB.conf" (previous: null, default: "C:\ProgramData\UMS\WEB.conf")
INFO 07:15:13.070 [main] Web conf path: C:\ProgramData\UMS\WEB.conf
INFO 07:15:13.071 [main] Web conf permissions: rw
INFO 07:15:13.071 [main]
DEBUG 07:15:13.083 [main] Reading run_wizard: false (default: true)
DEBUG 07:15:13.197 [pool-1-thread-1] Reading auto_update: true (default: false)
DEBUG 07:15:13.547 [main] Reading minimized: true (default: false)
DEBUG 07:15:13.555 [main] Reading hide_advanced_options: false (default: true)
DEBUG 07:15:13.555 [main] Reading server_name: "Office" (default: "Universal Media Server")
DEBUG 07:15:13.626 [main] Reading renderer_default: "PlayStation 3" (default: "")
DEBUG 07:15:13.645 [main] Reading maximum_bitrate: "0" (default: "90")
DEBUG 07:15:13.646 [main] Reading automatic_maximum_bitrate: true (default: false)
DEBUG 07:15:13.647 [main] Reading prevents_sleep_mode: true (default: false)
INFO 07:15:13.648 [main] Loading renderer names from C:\Program Files (x86)\Universal Media Server\renderers
DEBUG 07:15:13.656 [main] Added file watch at renderers: renderers\\Apple-iDevice-AirPlayer.conf
DEBUG 07:15:13.658 [main] Added file watch at renderers: renderers\\Apple-iDevice.conf
DEBUG 07:15:13.659 [main] Added file watch at renderers: renderers\\BlackBerry-PlayBook-KalemSoftMP.conf
INFO 07:15:13.661 [main] Loading MediaInfo library
INFO 07:15:13.773 [main] Loaded MediaInfoLib - v0.7.71
DEBUG 07:15:13.774 [main] Option 'File_TestContinuousFileNames' is set to: 0
DEBUG 07:15:13.774 [main] Option 'ParseSpeed' is set to: 0.000