Packet loss with 1000BaseT since 10.5

Question

Hi there!
Rarely, I connect my MacBook to my PC using an Ethernet Cable. As my PC has two ethernet interfaces, I use the 100mbit one for internet and the gigabit one to connect my macbook.
To make a long story short: last time I connected it, everything worked fine. At that time 10.4 was still installed on the MacBook. Yesterday I encountered packet loss of about 30% and a net transfer rate below AirPort. For testing purposes, I switched back to 100BaseTX and behold! Everything was back to normal (on 100 mbit, though).
The only thing I've changed was the OS installed on my MacBook (installed new and "fresh"), the cable used and software on my PC (like ethernet drivers and so on) are still the same.
Are there any known issues with the ethernet drivers of 10.5(.1)?
Bye
Steffen

Answer 1

Here is what I did to solve the problem:
1. Open iCal and export every calendar to desktop.
2. Delete every calendar in iCal including the birthday calendar and all subscriptions.
3. Open Finder and go to User/Library/Calendars and delete everything in the folder.
4. Go to User/Library/Application Support/iCal and delete this whole folder.
5. Go to User/Library/Application Support/iSync and delete everything in this folder.
6. Open iCal and import each of your calendars one at a time. Re-subscribe to subscription calendars.
7. Open iSync and hopefully it works for you because it worked for me.