I tried to upgrade to 1.5.2 using first the WordPress automatic plugin update procedure and after it erased the previous version, it failed to install the new version. Everything disappeared now!!!
Then I tried to upgrade by downloading the zip and uploading it to the server and it gets hung up while "unpacking the package" and gives me this error message: Could not create directory. /var
The worst part is that I mistakenly did this in my production server thinking that I was doing it in the test server, and now everything (forms and entries) has disappeared!!!!