Black 100%

I am using Adobe CS4 and creating a tabloid publication in InDesign.
The printer (a newspaper) returned the document to me because the black is not 100%.
I have gone in and physically changed all the black text to C0 M0 Y0 K100.
However, when I save the document and open it again, it reverts to the old setting - a CMYK mix.
I tried adjusting the black settings under preferences but that didn't work.
I also tried shutting off color management and that didn't work.
Basically, the problem with the color management is happening in InDesign before I ever try to convert the file to a .pdf.
Please let me know if you have suggestions for what to try to achieve the 100% black my printer is demanding.
Thanks.

Peter:
You said ...
Are you saying you have text that you set at 100%K in ID, you save the file, close and reopen in ID and the text is now four colors? That would be a long way from normal behavior and indicates a serious application or document corruption problem.
Yes, that's exactly what's happening - and this isn't the first document where I've had this happen. I don't know why my changes are not being saved in regard to this file.

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