On the Invision Plus Blog, I got this error after upgrading to the latest version of WordPress:

`Fatal error: Call to undefined function: get_currentuserinfo() in /home/blahblah/public_html/wp-blog-header.php on line 169′

I followed the suggestion of someone on the WordPress forums, and it worked:

“i fixed this by moving all the functions inside pluggable_functions.php over to template-functions-general.php .. for anyone else thats having trouble”

Thanks!