Image Processor won't close images

Does it happen for all images you run on? (do you have the same problem with JPEG or TIFF as you do with DNG) If you run Image Processor without the action, do the images close normally? 

I'm trying to determine if it's the action or something about these files that it causing the problem, or a combination of both.

Might need a copy of the action and/or the a few of the files to reproduce and debug.

I do run an action within Image Processor. It saves files to the destination folder but leaves all the images open

Can you attach a screen a screen shot of your image processor settings? Are you running an action within Image Processor? Does it leave all images open or only some images?