Jaunty Beta: Files disappear!

Today, I installed Jaunty Beta. Let me describe the starting point, what I did and what happened;

I had Intrepid installed with two ext3 partitions; / and /home. I don't use swap and I don't have any other partitions. I only have one hdd.

I downloaded the i386 image and made a bootable usb memory stick from it, then rebooted and installed it. I chose to format / as ext4 while keeping /home as ext3 without formatting it. I created a user with a different name than the one I had in intrepid so not to cause any conflicts with home folders.

When I rebooted into the newly installed Jaunty, I logged in using the username I created during the installation process. I then renamed my old users home directory, recreated that user and began to move the files and folders I wanted into the new home. Then I changed ownership to that user and set the right file permissions on the home and the files therein, recursively. I then logged out of the temporary user and attempted to login using the newly created user, but couldn't. I got several error messages about ICE Authority(? I'm sorry, I didn't record the messages).

I then logged back into the temporary user, run nautilus as root and navigated to the new users home to see what the problem was. I discovered that none of the files I'd moved there, was actually there. I navigated to the original folder which I'd renamed, and discovered the files weren't there either! In other words, they appeared to have been deleted, but not copied.

I opened a terminal and used ls -la, which confirmed that the files really weren't there. In "desperation", I rebooted into the usb live session, mounted the home partition, and nautilus still didn't show the files. However, when I used ls -la in a terminal, I suddenly found them and were able to copy them to an external disk for later retrieval.

I don't know what happened here, and I don't know how to find out, but I hope someone does, because I see this as a really serious bug.