Strange activity after upgrading to 2.9

Hello all,

After the last update to 2.9, I get the following error messages, to the error.log at the folder I have installed wordpress:

Please note that: wordpress in installed to a dedicated server
and the following errors, are everytime I write a new post. Also note that in the past, I didn’t have such errors or problems.

(below it’s just one copy of each error, because already I have up to 20 same errors!)
[01-Dec-2009 10:37:58] PHP Warning: gzuncompress() [function.gzuncompress]: data error in /xxxx/xxxxx/public_html/wp-includes/http.php on line 1792
&
[26-Dec-2009 23:39:06] PHP Warning: gzuncompress() [function.gzuncompress]: data error in /xxxx/xxxx/public_html/wp-includes/http.php on line 1831

I already searched the http.php file, to see which lines are 1792 & 1831 and are the following:

1792
* @subpackage HTTP
–>this is the 1792, the empty!!!–> */
class WP_Http_Encoding {

1831
$decompressed = gzuncompress( $compressed );

thank you all in advance
Sonia