Problem with DNG raw files slideshow and preview image size

[photomy]

I have the Adobe most recent .dng codec loaded.  I converted NEF files with Adobe DNG converter set at 1:1 for previews.  I am unable to get anything except small size DNG images.  The NEF files show up just fine with the full size version.

Any ideas?

Using Beta 5

Thought I would add this from support menu:

"List of installed codecs:
   Codec 'BMP Decoder' for extensions .bmp,.dib,.rle
   Codec 'GIF Decoder' for extensions .gif
   Codec 'ICO Decoder' for extensions .ico,.icon
   Codec 'JPEG Decoder' for extensions .jpeg,.jpe,.jpg,.jfif,.exif
   Codec 'PNG Decoder' for extensions .png
   Codec 'TIFF Decoder' for extensions .tiff,.tif
   Codec 'WMPhoto Decoder' for extensions .wdp,.jxr
   Codec 'Nikon .NEF Raw File Decoder' for extensions .nef
   Codec 'Phase One Image Decoder 2' for extensions .TIFF,.TIF,.IIQ,.IIP,.EIP,.MOS
   Codec 'Adobe Digital Negative Format File Decoder' for extensions .dng


Testing file 'D:\0 0 PHOTOFILES\2011\05-13-Fri\20110513_TR81342.dng'
   Thumbnail: Codec 'Adobe Digital Negative Format File Decoder'
      () 170x256 pixel in 593 ms.
   Preview: Codec 'Adobe Digital Negative Format File Decoder'
      () 170x256 pixel in 406 ms.
   Full resolution: Codec 'Adobe Digital Negative Format File Decoder'
      () 2832x4256 pixel in 405 ms."

[Mario]

Preview: Codec 'Adobe Digital Negative Format File Decoder'
      () 170x256 pixel in 406 ms.

That's the problem. IMatch by default always uses embedded previews in RAW files (DNG is a RAW file in this sense). The WIC codecs then usually return the full-size embedded JPEG preview from the RAW, or the DNG.

The WIC encoder from Adobe returns a 256 pixel image instead, which seems to be a bug in the codec.

You can work around this bug by either installing a another codec (e.g. from Microsoft or FPV) or by switching IMatch to ignoring the embedded preview for cache generation: Edit > Preferences > Cache: Use embedded preview: No. But this may have a bad impact on overall performance because IMatch then always requests the full RAW from the codec, which can be up to 20 times faster than using the embedded preview.