White Screens after updating (on windows server)

Please post the stack trace from the php/web server error log file when the fatal error occurs?

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@ giraffian, you are not alone.
I am experiencing the same problem. Also windows server btw (why oh why)

Had an old drupal site that started having problems after host updated to PHP5.3. So I downloaded to local machine. Made updates to core and modules (including themekey), everything running smoothly.
Uploaded site -> WSODs

Only working page is /user but logging in as admin just yields 'site offline'.
Admin pages give me 'access denied'
Regular pages just show a WSOD.
^^ do these qualify as obscure permissions errors?

Only thing visible in the providers' backend / logs is :

PHP Fatal error: Call to undefined function themekey_node_nid2vid() in [path.to]/themekey/themekey_base.inc on line 447

Not exactly the same issue as giraffian, but very close?

My guess is it has something to do with windows server environment and updating from older versions?
I went from 1.x (I believe 1.3, not sure) to 4.0 version of themekey.

I re-read giraffions description and tried his suggestion.
Disabling the themekey module manually removed the problem.
Not ideal (as I really want to use ThemeKey) but at least the site is up and running again.

Please let me know what other info I can provide.

Just updating. I have requested the following from the hosting provider:

• Better PHP logs
• Stack trace for the error
• What kind of caching mechanisms they use
• Whic server OS PHP mysql version they are running

Is there any other information which would help?

Did you clear the caches on the server?

A stack trace of the fatal error would be helpful!

I reviewed the code and probably found something. Can you post the current value of the variable "themekey_modules"?

I guess module 'node' is missing in variable "themekey_modules".

If you update ThemeKey and run the database update, the last step of the update is to update all the variables:

function themekey_update_6302() {
  module_load_include('inc', 'themekey', 'themekey_base');
  module_load_include('inc', 'themekey', 'themekey_build');
  themekey_rebuild();

  return array();
}

So if you updated the module on a different server, how did you deploy it to the live server?
Copied the code and the complete database including the tables system, variable and cache?
I assume, one of these tables is not up to date.

Thanks mkalbrenner, my apologies for not responding sooner.
Unfortunately my request for more info from the hosting provider went largely ignored. They are unable to supply me with a stack trace.

To answer your other qeuestions:
- yes, I did clear caches (cleared appropiate tables using mysql)
- I did the update by clearing the www-root directory, uploading the updated files and clearing and importing the entire database. I also used the same files (and DB) on other servers, worked fine on those.
- themekey_modules in variables table is (currently )set to :

a:7:{i:0;s:15:"themekey.locale";i:1;s:13:"themekey.node";i:2;s:13:"themekey.user";i:3;s:15:"themekey.system";i:4;s:17:"themekey.taxonomy";i:5;s:16:"themekey.comment";i:6;s:13:"themekey.menu";}

Unfortunately I do not know what is was at the time of malfunction.

There were a lot of other problems on the website. These disappeared without any intervention on my part. After these were all gone I re-enabled the themekey module and after visiting the themekey settings page all problems were gone.

I am sorry I can not provide more info, but it seems to me the caching software used by the hoster was ill-configured somehow. I don't know how else to explain this behaviour.

FYI I just had this issue on a site as well. D6, upgraded to 6.26 from I think 6.19. I noticed pages giving the error "undefined function themekey_node_nid2type() in /var/www/www.[domain].com/sites/all/modules/themekey/themekey_base.inc on line 447"

Clearing cache didn't work itself. Also disabling/re-enabling module didn't work by itself. After these efforts I visited admin/settings/themekey and saved those settings (no changes). Then I went to admin/settings/themekey/settings and saved those settings (no changes). This seems to have resolved my issue. No errors now.

I also noticed the server had been updated to PHP 5.3.3 (from 5.2) which I had not been informed would happen.