[galaxy-dev] file upload issue

I recently installed galaxy program on our Linux server and it is going to be used for analyzing high-throuput sequencing data.   I tried  to upload a dataset (a bed format file) from local computer to galaxy server, but no success.  The message of "Dataset is uploading" stays forever.  The uploaded dataset was shown on the /galaxy-dist/database/tmp directory, but it didn't get transferred to the job-working directory or files directory before it was deleted by the galaxy.   The output of run_functional_tests shows that uploading file went successfully.  The paster.log file doesn't show error message about the uploading.   Any configuration did I miss?   Your feedback is highly appreciated. Thank you! Weihong