DNG file processing issue

I enabled DNG support on my gallery2 page. Though there are some problems w/ DNG files:

1) EXIF/IPCT data is missing. There's a thread already open on this.

2) the thumbnail/resized image looks weird. seems they have too much blue/purple color.

3) it always shows the original image. I have processed some DNG images w/ cropping and WB, color stuff, but the changes are not taken. not sure it's dcraw issue or gallery2 issue though.

take a look at http://gemini.dynup.net/gallery2/v/wsun2/wsun2_travel/us/gsm_2007/waterfall/waterfall_072107_011.dng.html It has all 3 problems I described.