* warning: array_map() [function.array-map]: Argument #2 should be an array in C...

Are you using a custom theme? Is it Drupal 6 compatible?
If you have any regions[] in your theme's theme-name.info file, make sure that they are correct.

If you find a problem in one of your active themes and fix it, them visit the admin/build/modules page and let it load.

Getting same type of error - have been unable to change out of current theme (custom subtheme based on Blueprint) and get following in D6.13, if I remove my default (custom) theme, yet know that a different, valid theme is set [in MySQL]:

warning: array_map() [function.array-map]: Argument #2 should be an array in *PATH_TO_DRUPAL*/modules/system/system.module on line 966.
warning: array_keys() [function.array-keys]: The first argument should be an array in *PATH_TO_DRUPAL*/includes/theme.inc on line 1771.
warning: Invalid argument supplied for foreach() in *PATH_TO_DRUPAL*/includes/theme.inc on line 1771.

Toggled between using separate admin theme, then back to default: no effect
Tried switching to Garland*: no effect
Downloaded Acquia Marina*: no effect
Disabled all themes except one (to see if user-selected theme had any influence): no effect
Deleted custom theme: just have site rendered with system CSS and still cannot effect change of theme - ultimately resulted in above error

So I had a look in MySQL tables. When I switched default theme, MySQL actually records the selected theme I wanted in variable>theme_default (examples are *), but my site does not render the switch. The admin/build/themes page shows either my custom theme as selected (or none selected at all after deleting theme), even if a different theme is set to default in the MySQL tables.

I've been disabling modules left-right-and-centre but this is not helping (Sections was my first guess, but that had no effect; a little worried that OG is the culprit, but that's kind of essential to my current project). I had noticed that changing the theme used by the OG (mysql og>og_theme) works as expected, and I can have a separate Admin theme running... but then changes to Blocks are not reflected in the default theme. *aaaargh* (BTW I have flushed caches MILLIONS of times).

So I'm now completely stuck. I think it could be related to contrib modules not implementing hook_init() properly (see #219910), which is an "unsupported feature" of D6.

So is there any clue as to what is preventing this?

I seem to be getting this same issue periodically using Drupal 6.13 with a Zen subtheme I created. I can't figure out what's causing it but randomly the site will "lose" the theme and if I go to admin/build/themes the theme comes back however the subtheme I was running doesn't have a check in the "Enabled" column.

I added a bug report to the Drupal Issues Queue about this here: #578144: Main theme lost

I had the same issue with Drupal 6.12 and having vertical_tabs and the Admin module running at the same time. I was actually fine until I added the Vertical_tabs module. So, this is "theme/layout" related type of problem.

Only until I disabled the Admin module did this error magically go away.

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i got same error massage

i solved it

1) opened homepage (got error message)
2) go to: http://example.com/update
3) updated database
4) worked :-)
5) still confused ... but happy ;-)

seems that this is a problem with other theme or captcha??

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For me, this was caused by the bug that causes all themes to be disabled. It appears to sometimes be triggered by update.php and sometimes by cron.

It was (in my case) easy to fix:

* go to your Themes page ( www.example.com/admin/build/themes )

* notice that, while one theme is selected as the default theme, NO themes are actually enabled

* re-enable your default theme (and any others you wish to enable)

* click Submit