Cannot Browse Media Library

What steps will reproduce the problem?
1. run ps3mediaserver (v.1.20.409) under mac osx 10.6.5 
2. try to browse media library
3. you get in the client an empty list

What is the expected output? What do you see instead?
I see this in the ps3mediaserver log:
[Thread-18] TRACE 19:26:26.480 Exception in thread "Thread-18" 
java.lang.NumberFormatException: For input string: ""
[Thread-18] TRACE 19:26:26.480  at 
java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
[Thread-18] TRACE 19:26:26.480  at java.lang.Integer.parseInt(Integer.java:470)
[Thread-18] TRACE 19:26:26.480  at java.lang.Integer.parseInt(Integer.java:499)
[Thread-18] TRACE 19:26:26.480  at 
net.pms.network.Request.answer(Request.java:360)
[Thread-18] TRACE 19:26:26.480  at 
net.pms.network.RequestHandler.run(RequestHandler.java:162)
[Thread-18] TRACE 19:26:26.480  at java.lang.Thread.run(Thread.java:680)

What version of the product are you using? On what operating system?
ps3mediaserver (v.1.20.409) 
under mac osx 10.6.5 

the useful log piece:

[Thread-14] DEBUG 19:26:24.997 Receiving a NOTIFY from [192.168.0.8:63693]
[Thread-18] DEBUG 19:26:26.478 Opened handler on socket 
Socket[addr=/192.168.0.11,port=55558,localport=5001]
[Thread-18] DEBUG 19:26:26.478 Received on socket: POST 
/upnp/control/content_directory HTTP/1.1
[Thread-18] DEBUG 19:26:26.478 Received on socket: Host: 192.168.0.8:5001
[Thread-18] DEBUG 19:26:26.478 Received on socket: User-Agent: UPnPPeek/1.2 
CFNetwork/485.12.7 Darwin/10.4.0
[Thread-18] DEBUG 19:26:26.478 Received on socket: Soapaction: 
"urn:schemas-upnp-org:service:ContentDirectory:1#Browse"
[Thread-18] DEBUG 19:26:26.479 Received on socket: Content-Length: 445
[Thread-18] DEBUG 19:26:26.479 Received on socket: Content-Type: text/xml; 
charset="utf-8"
[Thread-18] DEBUG 19:26:26.479 Received on socket: Accept: */*
[Thread-18] DEBUG 19:26:26.479 Received on socket: Accept-Language: it-it
[Thread-18] DEBUG 19:26:26.479 Received on socket: Accept-Encoding: gzip, 
deflate
[Thread-18] DEBUG 19:26:26.479 Received on socket: Connection: keep-alive
[Thread-18] TRACE 19:26:26.479 Media renderer was not recognized. HTTP User 
agent :UPnPPeek/1.2 CFNetwork/485.12.7 Darwin/10.4.0
[Thread-18] INFO  19:26:26.479 HTTP: upnp/control/content_directory / 0-0
[Thread-18] DEBUG 19:26:26.479 Wrote on socket: HTTP/1.1 200 OK
[Thread-18] DEBUG 19:26:26.479 Wrote on socket: CONTENT-TYPE: text/xml; 
charset="utf-8"
[Thread-18] DEBUG 19:26:26.479 Close Connection
[Thread-18] TRACE 19:26:26.480 Exception in thread "Thread-18" 
java.lang.NumberFormatException: For input string: ""
[Thread-18] TRACE 19:26:26.480  at 
java.lang.NumberFormatException.forInputString(NumberFormatException.java:48)
[Thread-18] TRACE 19:26:26.480  at java.lang.Integer.parseInt(Integer.java:470)
[Thread-18] TRACE 19:26:26.480  at java.lang.Integer.parseInt(Integer.java:499)
[Thread-18] TRACE 19:26:26.480  at 
net.pms.network.Request.answer(Request.java:360)
[Thread-18] TRACE 19:26:26.480  at 
net.pms.network.RequestHandler.run(RequestHandler.java:162)
[Thread-18] TRACE 19:26:26.480  at java.lang.Thread.run(Thread.java:680)
[Thread-13] INFO  19:26:45.351 Sending ALIVE...
[Thread-13] DEBUG 19:26:45.351 Searching network interface for 192.168.0.8
[Thread-13] DEBUG 19:26:45.351 Sending message from multicast socket on network 
interface: name:en1 (en1) index: 6 addresses:
/192.168.0.8;
Original issue reported on code.google.com by nkjoep on 3 Jan 2011 at 6:32
Unknown1User / ps3mediaserver

Cannot Browse Media Library #936
