Form become white after running java app. under windows XP

Hi,
i developed an application (Form base application) that connect to FTP server and connect to a server via telnet.
The application is running fine until i'm trying to run it under Windows XP.
when i'm running the applicaion under windows XP and sending data, the form become WHITE (looks like stuck program).
the app. is still running but the user think the app. is stuck.
i try to INVALIDATE the form every time the loop is sending the data and many more ideas but it is still become white.
the app. is working greate under windows 2000, 98, ME.
does anyone know this problem and how to fix it?
Thanks Guy.

i "just" develope an application that connected to an exsiting servers and upload data to them.
the problem is that when i run this app. under windows XP, the screen ( the application created in "Form Base") become white, like the program is stuck.
there is no error, it's seems to be an invalidate problem, but i try to out invalidate everywhere but it is still doen't fix this problem.
the app. doesnot stuck, it is just looks like that!!!!!
the weird thing is when i run this app. under all other windows, it's working fine.
if anything is not clear, write back.
thanks.

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