White Page & Multiple Array Errors Since 3.0 Upgrade

I apparently have a significant number of issues since my upgrade yesterday. I’m quite ineffective in coding, but am hoping this community can get me back on my feet.

Since the upgrade my site simply loads a blank page. I am able to access the dashboard but am greeted in the “Right Now” box by:

Warning: array_keys() [function.array-keys]: The first argument should be an array in /home/.sites/60/site236/web/photography/wp-includes/theme.php on line 513

First response was to disable plugins. I only use Akismet & Twitter Tools but upon going to disable them I was told they were already disabled due to an error. Just this minute I returned there to provide any warnings to this message and it simply shows that I do not appear to have any plugins. This was not what the pages showed the last time I went to it.

Second step was to revert to the original theme, but I cannot because the theme management page shows five errors including failing to display any themes from which to choose.

Warning: array_keys() [function.array-keys]: The first argument should be an array in /home/.sites/60/site236/web/photography/wp-includes/theme.php on line 513

Warning: uksort() [function.uksort]: The argument should be an array in /home/.sites/60/site236/web/photography/wp-admin/themes.php on line 73

Warning: array_slice() expects parameter 1 to be array, boolean given in /home/.sites/60/site236/web/photography/wp-admin/themes.php on line 94

Manage ThemesInstall Themes
Current Theme
by

All of this theme’s files are located in .
Available Themes

Warning: array_keys() [function.array-keys]: The first argument should be an array in /home/.sites/60/site236/web/photography/wp-admin/themes.php on line 150

Warning: natcasesort() [function.natcasesort]: The argument should be an array in /home/.sites/60/site236/web/photography/wp-admin/themes.php on line 151

There is no data after “Current theme by” or after “… files are located in”.

I have tried reinstalling WP 3.0. The initial and second install were both reported as successful.

I do need to upgrade my Sliding Door theme to the current, but delayed because of the customization I’ve done. That customization only involved additional links and text in the sidebar and font tweaks. No php.

Thank you for any help or direction because this n00b is stuck badly.