[galaxy-dev] empty status for non-empty datasets

Hi, In our local galaxy install (currently revision 50e249442c5a) we are seeing few output datasets as 'empty' in the galaxy web interface. The actual file size on the filesystem is ~ 4GB. These 'empty' files can be downloaded by clicking on download/view icons, however they can't be imported in other workflows. I looked into the database and figured out that file_size column value for corresponding dataset id is zero. I am guessing that's why it is being shown as empty in the web interface. Any suggestions on how to resolve this will be helpful. -- Thanks, Shantanu.