Another thing to watch for is an old 500 series build. A 600 series build will not upgrade a 500 series correctly (this is documented on the Activestate website). I know this because we upgraded an early 600 series to 631 without noticing an old 500 series build that was never unistalled. I can't tell you how many strange error we ended up getting from this lovely little problem. We ended up removing all installations of perl and removing any registry entries with the word perl in them to fix it.
It is such an improvement to keep your critial setup information in a obfuscated hack of a database, than easily read and searched flat files
grep
grep> cd pub
grep> more beer |