An interesting problem when I using longer time with Ubuntu 10.04 release

[Hammer Attila]

Dear List,

I see an interesting problem with my final Ubuntu 10.04 system, prewious
time I not see this problem.
I installed with my system the 2010.04-27 daily live CD, and install
updates with all day.
Some time if I using longer time the Orca screen reader and for example
browsing the internet, and try changing for example top/bottom panel
with Ctrl+Alt+Tab key combination, Orca is does'nt spokening the actual
choosed panel before I not release this combination. Another issue if I
try change task with Alt+Tab key combination, I not hear application
name with I jump before I release this key combination. If I restart
Orca Screen Reader, again working fine
this two task. I see this type problem after 20-30 minute use, and this
problem repeat again after this time period. Compiz is not enabled.

Now, all updates are installed. gnome-orca package version is
2.30.0-0ubuntu3, and at-spi package version is 1.30.0-0ubuntu2.

Anybody see this type problem? Possible help if I reinstall my system
with final Ubuntu CD iso?

This problem is related with following at-spi bug? The link is following:
https://bugs.launchpad.net/bugs/562776

Thank you the answers,

Attila