The new prime95 for SoB can now be downloaded. Several FFT bugs were fixed that should not have impacted SoB. The only change of importance is accepting floating point values in the Pfactor= line of worktodo.ini

You can get the versions from:

Windows: ftp://mersenne.org/gimps/sobpm1.zip
Linux: ftp://mersenne.org/gimps/sobpm1.tgz

The linux version is untested, I do not have Linux running on any P4s here.