I have my Nexus One connected with the USB.
When I visit the File Explorer of the DDMS, if I click on the "data" folder the little plus near the name "data" disappear for 2-6 seconds and then reappear but the contenct of the folder "data" is not showed!
Here some other information:
the folder data has permissions drwxrwx--x
the OS of my PC is Windows XP
Eclipse v. 3.5.2
Android SDK 1.6