I downloaded and installed Drupal 6.26 today. I deleted all my old files, then uploaded all the 6.26 files, ran update.php, and Drupal still says that I have version 6.25.
When I ran update.php, it said 0 of 0 updates, so I kind of wondered about it. Tried flushing cache, running cron, and running update again, still with no luck.
I tried it yet again—delete all files, upload new files—still didn't work. Any thoughts?