netboot with zdrv.sfs ??

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Please anyone, share your experience; have you successfully netbooted (PXE) puppies that include z-drive zdrv.sfs for kernel drivers?

I need help to netboot a Saluki 023 netboot image; I built the image with JamesBond's mknetboot.sh in http://www.murga-linux.com/puppy/viewtopic.php?t=64107. This image does netboot successfully, but shortly after saluki displays its "confirm config" Xdialog an error dialog shows up which says "kernel couldn't load drivers; can't find zdrv.sfs; please add zdrv.sfs to the pup-save location" and puppy freezes.

Any ideas what might be wrong? I already verified that the initrd.gz file includes file zdrv.sfs, so it isn't a matter of that file being missing, I speculate, but rather that it isn't recognized after a netboot.

Thanks in advance.