Question An invalid post ID was requested

Hello
All the time I have:
An invalid post ID was requested: www.sportowa.zgora.pl/forum/2-welcome-mat.html
(in polish: Nieznane ID postu.)
when I try to read some post.
I've tried everyting, update forum, delete and install again.
Please help

Here is forum index: www.sportowa.zgora.pl/forum.html

ps. I red this: www.kunena.com/forum/139-solved-or-prior...ost-id-was-requested (and "Moderated forum..." link) but any positive resuls.

Installed version: Kunena 1.6.0-RC2 | 2010-08-31 | 3373 [ Jadili ]
Joomla 1.5.20

RCS:

Database collation check: The collation of your table fields are correct

Legacy mode: Disabled | Joomla! SEF: Enabled | Joomla! SEF rewrite: Enabled | FTP layer: Disabled |

This message contains confidential information

htaccess: Exists | PHP environment: Max execution time: 30 seconds | Max execution memory: 32M | Max file upload: 8M

Kunena version detailled: Installed version: 1.6.0-RC2 | Build: 3373 | Version name: Jadili | Kunena detailled configuration:

Warning: Spoiler!

[th]Kunena config settings:[/th]

board_title	Kunena
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Third-party components: AlphaUserPoints: Disabled or not installed | CommunityBuilder: Disabled or not installed | Jomsocial: Disabled or not installed | UddeIm: Disabled or not installed

Plugins: System - Mootools12: Disabled | System - Mootools Upgrade: Enabled | JFirePHP: Disabled or not installed | Kunena Discuss: Disabled or not installed | Kunena Search: Disabled or not installed | My Kunena Forum Menu: Disabled or not installed

Modules: Kunena Latest: Disabled or not installed | Kunena Stats: Disabled or not installed | Kunena Login: Disabled or not installed

I disable: Search Engine Friendly URLs (set to Off)
And now it works. Why?

I'm sorry, I don't understand. What did you have enabled before (that caused things to not work) that, by disabling, now works? Could you please show a picture of what you're doing?

Have you read Search Engine Optimization (SEO) ?

If "Search Engine Friendly URLs" is set to No, forum is working. When I set this option to Yes, forum stop work:/
!But! I have other page with K1.6RC2: mojeokolice.net.pl/forum.html and in here SEFU is set to Yes and working:/

please try rc3 maybe It's working then

WOW! RC3 is out! Thx!