Mac is not showing in Finder's sidebar anymore (network)

Hello,
I have 2 Macs (an iMac and a MBP) connected to a router. The iMac is connected directly to the router (via cable) and the MBP is connected wirelessly. Usually both of them can access each other by just clicking on the Finder's sidebar where the other one appears automatically. As far as I know these things are done by Bonjour. This has been working great for a while now, but last weekend the issues began.
The problem is that my iMac doesn't appear in the Finder's sidebar of my MBP anymore. The weird thing is, that it works the other way round. This means that my MBP is showing up properly in the Finder's sidebar of my iMac and I can also connect to it. I can also connect to my iMac (from my MBP) manually via the "Go -> Connect to Server" function and enter something like "afp://192.168.0.104". So the AFP seems to work basically. I think that the problem is related to Bonjour, but I don't know how to fix it.
Btw both machines are running 10.6.4 with all updates.
Ok, so what I've tried so far:
- Repaired disk permissions (on both)
- Checked Finder sidebar settings: Bonjour computers is activated on both
- Checked File Sharing settings: AFP and SMB file sharing is activated on both
- Resetted router
- Restarted everything several times
Some additional information about my network configuration:
Router: 192.168.0.1 / 255.255.255.0
iMac: 192.168.0.104: Direct cable connection, static IP address
MBP: 192.168.0.11: Wireless connection, dynamic IP via DHCP
The only thing that I recently installed is iLife '11 and the latest Mac OS Java update (via software update). Well, I'm not sure if the problem occured immediately after that or if the problem was already there before. But can these software updates really affect Bonjour?
Well, I'm really running out of ideas
Any help or advice would be great.
Thanks in advance
Message was edited by: Acid

Open Terminal.app located in Utilities folder in Applications folder.
Once Terminal is running use this command followed by hitting the return key.
drutil eject<hit return key>
CD/DVD should pop out.
Lou Cioccio

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