Button does not show in applet on newer version of Safari

I have an applet that has only one button.
Upon loading, the button shows up nicely on Safari 5.0. However it does not show up for the first time in Safari 5.1, and if I refresh the page, it does show!
Is the problem due to Safari? I tried to use applet's validate() and repaint() but the button still does not show for the first time.
The problem happens only on Safari 5.1.

Does anyone face the same problem or have any ideas?

Thanks.

before running again try to delete the cache and cookies if you face the problem again please post code in forum.

gyan kumar wrote:before running again try to delete the cache and cookies if you face the problem again please post code in forum.

Yes, I empty the cache every time running the applet, the button still invisible in the newer Safari. But the older Safari shows the button correctly. Strange!