Bridge 2.1.1.9 problems with Nikon D300 NEF files

I am getting a few Raw files from my Nikon D300 that will appear properly in Bridge, but the majority either don't show a preview at all or are very pixelated in appearance. The ones that do appear fine can be opened in ACR by right clicking and selecting "open in camera raw". However, the others that don't appear properly don't even show the option to open in camera raw. Yet the files are okay, because I can then open them from within Photoshop and process the files like that. The other odd behavior is that if I right click the thumbnail and rename the file then the thumbnail preview suddenly appears properly. Lastly, the pixel dimensions show incorrectly until the file is renamed.

I am using Windows XP SP2 with Photoshop CS3. Any suggestions would be appreciated. This has been very frustrating because initially it appears that the file may be corrupt.

Thanks!