I have not seen any issues like that in the .dmps I have tested. Would you mind attaching some .dmps that you have had trouble with?
EDIT: I am able to reproduce the bugcheck link issue with .dmps I have from two months ago that worked fine two months ago. I am currently not sure if this is an issue with the apps or the html file being downloaded from your site. I will have to investigate to find out where the error is occurring and get back to you.
I will still need .dmps for the npf.sys issue you are seeing to investigate that problem.
EDIT2: I tracked down the HTML issue. Your HTML code now has extra spaces between lines that it did not have when I designed the HTML parser.