Scrollbar rebound

Hello everybody.
When in a master-detail form I have a problem when changing records in the master block using the vertical scrollbar if the query for the detail block is heavy. In my case the detail block has a tree element.
If I am in record #1, of the master block, and press down the scrollbar down arrow the scrollbar rebound and the block goes to the last record, record by record and the down arrow looks steadily down (pressed). The same happens if I am in the last visible record of the master block and press scrollbar up arrow; in this case the master block goes to the first record and the up arrow looks down (pressed).
I have workedaround this issue moving the scripts from the when-new-record-instance, of the master block, to a program unit, creating a timer in this trigger and calling the program unit from that timer.
I am using Forms10g but it also happens on Forms9i.
Any better solution?
Thank you.

Recommendation:
1. Install Patch 9593176 into your Forms environment (middle tier or Developer Suite)
2. Reconfigure your formsweb.cfg to support 1.6.0_23
3. On the client, uninstall ALL JREs (or Jinitiator) versions which are installed.
4. Delete the all the contents (files and folders) in C:\Documents and Settings\<USER NAME>\Application Data\Sun\Java\Deployment\cache
5. Reboot the client machine
6. On the client, Install the latest JRE (1.6.0_23).
7. Retest
8. If it still fails, try to create a simplified version of the problem in a new form. Base the new form on the Oracle demo tables, usually associated with the SCOTT schema (dept, emp ...).
9. Contact Support - they will want the test case and information about the results of the above steps taken.

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