Focus lost in Oracle Application Server

Dear All,
We developed a custom system using Oracle Forms Developer 10.1.2.0.2. An Oracle Application Server 10g runs our forms. Users use it across the Internet using MS Internet Explorer 7. If a form contains 2 blocks and a user clicks the another block, the focus remains at previous block even the cursor is in the proper field.
It used to work properly for a while (about 6 months). About 3 weeks ago the administrator restarted the server due to an error and since then we have been noticing this problem. We tried different versions of Java, different browsers(IE 7 and Firefox 3.6.3) at client side but the result is the same. I think the problem must be at server side but I don't have more ideas where it is.
Can anybody help me?
Thanks & Regards,
Laszlo

Laszlo,
Use the Sun Java console in Internet Explorer to see if you can find any errors ( IE -> Tools -> Sun Java Console). There is not much to see here but you can turn all kinds of logging on. See:
http://java.sun.com/j2se/1.5.0/docs/guide/deployment/deployment-guide/console.html
regards,
Bernhard Jongejan
http://bernhardjongejan.spaces.live.com

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