I was getting a similar problem with my upload.cgi. No data that the file contained appeared to be uploaded. I fixed it with help from virtualsue and boo_radley (I think? I'm sorry I can't remember :-( ) however I am not sure what exactly was the fix. I even tried a binary search through the patches I applied with no luck. Make sure that $cgi->upload is not returning undef and check whether you are not Suffering from Buffering. Also check your log files, use warnings and use strict