Is here anyone who has worked on Rebex FTP upload

Question

Hi all,

   I am using Rebex FTP for upload files to the server in a windows application. 

  I am able to upload small files but big files are not getting uploaded.
 
Actually the file is goin upto FTP server but after uploading to FTP it should return me something but wat i found is tat if the file is more then 15 mB the control never returns to my code.. it simply uploads upto FTP server and remains there only..

http://www.rebex.net/download/default.aspx

any help wil be highly appreciated..

thanx & regards
s_raj0205