Offline file transfer issue

Dear All,

I have recently installed openfire version 3.9.3 and using spark client 2.6.3 on Centos 6.5 64 bit

all is working fine but when I tried to send file from user A to a offline user B i see the message

the user is offline will auto send ( fillename) when the user comes back online.

but when user B comes online user A still see him as offline . but any IM sent by user A to user B is received by user B

only if user A log out and log in again then User A is seen as online …

but in any case the file is never received by user B

but if both are online there is no issue in receiving the file

wondering what it could be

appreciate your advice and help

regards

simon