WordPress MU

I upgraded from WPMU 1.1.3 to 1.3.3., everything went OK, but now I realized, that I am unable to edit certain pages, which is in hierarchy under another page , i.e. they are sub-pages. If I try to edit this page (this problem occurs with 2 more pages) everything seems OK, but if I save changes and look at page nothing has changed. (I checked cache and such things). If I made changes and click "Save and continue" again appears old version without any change.

Page has images, see here, but nothing other special:

<strong>Prodám tašku na na notebook</strong> 14,4 palců značky <strong>Dicota</strong>. <strong>Taška</strong> nebyla používána <strong>notebook</strong> byl nošen v batohu, je tedy jako nová. Nabídnout ji mohu i spolu s notebookem, jinak ji jsem ochoten prodat i zvlášť. Cena <strong>650 Kč</strong>.

<a href="http://dust.xixao.com/bazar/prodam-tasku-na-notebook-dicota/taska-na-notebook-dicota/" rel="attachment wp-att-93" title="taška na notebook dicota"><img src="http://dust.xixao.com/files/nb-taska070803_113104.thumbnail.jpg" alt="taška na notebook dicota" /></a>

Pokud máte zájem <a href="http://dust.xixao.com/bazar/kontakt-bazar/">kontaktujte mne</a>. Vše mohu předat osobně v Ostravě, nebo po domluvě v Olomouci.

Dodat k tašce mohu i:
<ul>
	<li><a href="http://dust.xixao.com/bazar/prodam-notebook-800-mhz-levne/">Prodám notebook 800 Mhz levně </a></li>
	<li><a href="http://dust.xixao.com/bazar/prodam-prenosnou-tiskarnu-k-notebooku/">Prodám přenosnou tiskárnu k notebooku</a></li>
</ul>

Strange is that other pages can be edited and saved without problems. Every change appears immediately. Posts can be edited without problems as well.

I tried to delete and create these pages, but problem appears again and again.

has anyone any idea what is behind that?

Either turn off the object cache or grab an updated file out of trac. It's a known issue.

I checked Trac, but obviously I was blind as I thought that cache issue have been already corrected in WPMU 1.3.3 installation.

this problem affects posts with attachments as mentioned here:
http://trac.mu.wordpress.org/ticket/557#comment:10

ok, to solve this problem enough is to download this version of /wp-includes/cache.php:
http://trac.mu.wordpress.org/changeset/1201

unfortunatelly I finally found that solution for "cache problem" see: http://trac.mu.wordpress.org/changeset/1201

causes problem when I have in /wp-includes/wpmu-functions.php
this line:
$wpdb->query("UPDATE $wpdb->options SET option_value = 'a:2:{i:1;s:29:\"cryptographp/cryptographp.php\";i:2;s:31:\"dd-formmailer/dd-formmailer.php\";}' WHERE option_name = 'active_plugins'");

which make some plugins activated automatically as new user register.

Any idea what to do? Btw how to turn off the object cache? define( 'ENABLE_CACHE', false); in config.php file doesn't help
Is there any other way how to make certain plugin to be activated automatically as new user create new blog?