Upgrading Drupal

I create a blog post and then go back to update it. And it won't show my new updates. I've set up a clear cache and that isn't working (using DEVEL module). The only way to get around this is to recreate the entire post and delete the old one. Anybody have a clue as to what's going on? The problem began once I went from an earlier version of 5.x to 5.18 .... Thanks, Mindy

I just upgraded from 4.7, to 5.19, then to 6.13. All seemed to go smoothly, except when updating the poll module during the 6.13 transition I had 4 errors. Here is the output from watchdog logs. Any idea how to fix this?

1. array_pop() [function.array-pop]: The argument should be an array in /var/www/domain.com/update.php on line 314

2. Table 'poll_choices' already exists query: CREATE TABLE poll_choices ( chid int unsigned NOT NULL auto_increment, nid int unsigned NOT NULL default '0', chtext varchar(128) NOT NULL default '', chvotes int NOT NULL default '0', chorder int NOT NULL default '0', PRIMARY KEY (chid), KEY nid (nid) ) /*!40100 DEFAULT CHARACTER SET UTF8 */ in /var/www/domain.com/includes/database.mysql.inc on line 174.

3. Table 'poll_votes' already exists query: CREATE TABLE poll_votes ( nid int unsigned NOT NULL, uid int unsigned NOT NULL default 0, chorder int NOT NULL default -1, hostname varchar(128) NOT NULL default '', INDEX (nid), INDEX (uid), INDEX (hostname) ) /*!40100 DEFAULT CHARACTER SET UTF8 */ in /var/www/domain.com/includes/database.mysql.inc on line 174.

Have been receiving these and other error message and unable to update cron since upgrade to 6.13

Warning: MySQL server has gone away query: INSERT INTO watchdog (uid, type, message, variables, severity, link, location, referer, hostname, timestamp) VALUES (1, 'php', '%message in %file on line %line.', 'a:4:{s:6:\"%error\";s:12:\"user warning\";s:8:\"%message\";s:118392:\"MySQL server has gone away\nquery: UPDATE cache_update SET data = 'a:13:{s:13:\\"advanced_help\\";a:10:{s:5:\\"title\\";s:13:\\"Advanced help\\";s:10:\\"short_name\\";s:13:\\"advanced_help\\";s:10:\\"dc:creator\\";s:13:\\"merlinofchaos\\";s:11:\\"api_version\\";s:3:\\"6.x\\";s:17:\\"recommended_major\\";s:1:\\"1\\";s:16:\\"supported_majors\\";s:1:\\"1\\";s:13:\\"default_major\\";s:1:\\"1\\";s:14:\\& in /home/xxxxxxx/public_html/includes/database.mysql.inc on line 128

I am running a local subnet Ubuntu web server. Tried to upgrade to 6.13 from 6.10. I clearly did something wrong.

Getting a bunch of these:

warning: unlink(sites/default/files/js/b95a1da8025206dbd0a8a8b7c34a86af.js) [function.unlink]: Permission denied in /var/www/includes/file.inc on line 435. when doing update.

and more of these:

The selected file /tmp/file9QD2Te could not be uploaded, because the destination sites/default/files/css/f1dc37f1278d631b348375c45fde2109.css is not properly configured.

when going to the Modules page.

I've made two attempts to upgrade from 6.12 to 6.13. Both have apparently failed as I still am receiving upgrade message:

Drupal core update status Not secure! (version 6.13 available)
There is a security update available for your version of Drupal. To ensure the security of your server, you should update immediately! See the available updates page for more information.

I'm also receiving this message:

I recently acquired a site using Drupal 4.7 and would like to upgrade/get current. Is it possible to jump 4.7 to 6.13, or must I do subsequent upgrades with 5.19 first?