It seems like emul-linux-x86-gtklibs-2.10.6 is missing gtk-1.2 required by nero: ldd /usr/bin/nero linux-gate.so.1 => (0xffffe000) libpthread.so.0 => /lib32/libpthread.so.0 (0xf7f13000) libgtk-1.2.so.0 => not found <snip> emul-linux-x86-gtklibs-2.8.8 still have it and works fine.
oops, forgot to put it in the new package, re-added, should work fine now.