File Styles Preview fails when system set to private download method

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Actually, it looks like the file_styles_variable_get() call is asking for a system variable that doesn't exist (preview_image_directory).

I took a peek over my database, and none of the variables requested in the code below are defined anywhere in the database.

Here's where I suspect the code is tripping up. file_styles.module line 80.

function file_styles_preview_image($replace = FALSE) {
  $path = file_styles_variable_get('preview_image');
  if (!$path || $replace) {
    $dir = file_default_scheme() . '://' . file_styles_variable_get('preview_image_directory');
    if (file_prepare_directory($dir,  FILE_CREATE_DIRECTORY)) {
      $source = file_styles_variable_get('image_style_preview_image');
      if ($path = file_unmanaged_copy($source, $dir . '/' . basename($source), FILE_EXISTS_REPLACE)) {
        file_styles_variable_set('preview_image', $path);
      }
    }
  }
  return $path;
}

I am seeing something similar. It appears that the module is trying to write to the wrong directory.

When File System is set to Private upload I get this problem. When set to public, there is no problem. If I look at the directories used by styles it has not written any "private" folders in its directories, only public... i.e. lots of write access errors

It keeps trying to write here

<img typeof="foaf:Image" src="http://www.mysite.co.za/?q=system/files/styles/square_thumbnail/private/image.jpg" alt="">

When it should be writing and reading here:

<img typeof="foaf:Image" src="http://www.mysite.co.za/?q=system/files/private/styles/square_thumbnail/image.jpg" alt="">

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