No longer able to burn dvd isos

[ions]

In Nautilus when I right-click on an iso and choose 'Write to Disc' I get this error:

"Reload a rewritable or blank disc

Please replace the disc in the drive with a CD-R/CD-RW/DVD-RW/DVD+R/DVD+R DL/DVD+RW, with at least 4489 MiB free."

The DVD in the writer is of course a new 4.7. I tried several.

Oh, I'm using dvd+rw-tools 6.1.....so:

localhost chris # emerge -a =app-cdr/dvd+rw-tools-6.0

Same thing happens in Nautilus so I try growisofs instead:

# growisofs -dvd-compat -Z /dev/dvd=dvdr.iso
:-( unable to anonymously mmap 33554432: Resource temporarily unavailable
localhost chris # ulimit -l unlimited
localhost chris # growisofs -dvd-compat -Z /dev/dvd=dvdr.iso
Executing 'builtin_dd if=dvdr.iso of=/dev/dvd obs=32k seek=0'
:-( /dev/dvd: 2297888 blocks are free, 2297976 to be written!

Using Gentoo Unstable AMD64.

[ions]

Downgraded to dvd+rw-tools-5.21.4.10.8. Still fails.

Here's more of the same, this is what Gnomebaker yaps at me:

Executing 'builtin_dd if=/home/chris/dvdr.iso of=/dev/hdd obs=32k seek=0'
:-( /dev/hdd: 2297888 blocks are free, 2297976 to be written!