I upgraded WordPress installation to version 2.6.5 shortly after it was released. Thanks to “WordPress Auto Upgrade” plugin, the process couldn’t get any easier.
All was well until I found out that I have lost the “visual editor” somewhere along the upgrade. I found the solutions in WordPress.org forums. I finally got the visual editor working again.
In addition to that I found out another solution to a different problem. I have initially installed a WordPress blog using Yahoo! Web-Hosting control panel. After an upgrade to version 2.5, I still couldn’t log on to the blog isn’t WordPress iPhone App. It turns out that some extra blank lines in one of Yahoo!-provided plugins caused the error. So if you’re using a Yahoo!- installed WordPress blog, you might want to edit out the blank lines at the end of “Customizable Permanent Link” plugin. Check other plugins too if necessary for the blank lines at the end of the file.