I have the same trouble after the hosting change...
Text Formatted Code
Mon Apr 26 18:47:26 2010 - Unable to unserialize s:67:"/home/a/webserver/site/site.com.ua/backend/geeklog.rss"; for Core:rdf_file
Mon Apr 26 18:47:26 2010 - Unable to unserialize s:48:"/home/a/webserver/site/site.com.ua/"; for Core:path_html
Mon Apr 26 18:47:26 2010 - Unable to unserialize s:44:"/home/a/webserver/site/language/"; for Core:path_language
Mon Apr 26 18:47:26 2010 - Unable to unserialize s:43:"/home/a/webserver/site/backups/"; for Core:backup_path
Mon Apr 26 18:47:26 2010 - Unable to unserialize s:40:"/home/a/webserver/site/data/"; for Core:path_data
Mon Apr 26 18:47:26 2010 - Unable to unserialize s:55:"/home/a/webserver/site/site.com.ua/images/"; for Core:path_images
Mon Apr 26 18:47:26 2010 - Unable to unserialize s:47:"/home/a/webserver/site/system/pear/"; for Core:path_pear
Mon Apr 26 18:47:26 2010 - Unable to unserialize s:55:"/home/a/webserver/site/site.com.ua/layout/"; for Core:path_themes