I just installed 1.5 last night. I was seeing the Hello Dolly lyrics in the top right corner although I didn't have the plugin activated. In reading through a tutorial on uploading images and using them in posts I saw that there should be an "Insert Image" link where the lyrics were, and figured I'd turn off the plugin (although it was listed as not active) and see if the link appeared. So I clicked the "Activate" link (figuring I'd then click "Deactivate") and the everything broke.
Now all I get is the following error message:
Fatal error: Cannot redeclare hello_dolly() (previously declared in /home/voxnoxi/www/www/wp-content/plugins/hello.php:48) in /home/voxnoxi/www/www/wp-content/plugins/hello.php on line 47
My blog is at http://www.voxnoxi.com if anyone needs to take a look. I have no idea what's wrong and how to fix it.