My files are disappeared from the UbuntuOne synced folder

I set up an UbuntuOne account on PC1 (Ubuntu 10.10). Then I set up the same account on PC2 (Ubuntu 10.04).

I put a text file named maverick.txt in PC1's "~/Ubuntu One/log/".

I put a text file named venus.txt in PC2's "~/Ubuntu One/log/".

I found the two text files appeared in one.ubuntu.com.

Then, a few hours later, those two files are disappeared from

    * PC1's "Ubuntu One/log/"
    * PC2's "Ubuntu One/log/"
    * one.ubuntu.com

So, my files are gone forever.

I set up an UbuntuOne account on PC1 (Ubuntu 10.10). Then I set up the same account on PC2 (Ubuntu 10.04).

I put a text file named maverick.txt in PC1's "~/Ubuntu One/log/".

I put a text file named venus.txt in PC2's "~/Ubuntu One/log/".

I found the two text files appeared in one.ubuntu.com.

Then, a few hours later, those two files are disappeared from

    * PC1's "Ubuntu One/log/"
    * PC2's "Ubuntu One/log/"
    * one.ubuntu.com

So, my files are gone forever.

Is there any way to recover those files?