The conversion for ToB that's documented in the FAQ by Maedin is a hack workaround that works at least some of the time. I have never been able to get it to work with ToB, though. Just once I'd like to surge while MM'ing Sarevok!
I can send you the source - I have versions for both Windows and Mac OS X. I really don't think the problem lies in Tiger compatibility, though. The SET_STRING errors are there because it's looking for ToB. The loading errors are there because in the older versions of WeiDU (on which Tutu is based), it would not ignore the '.' and '..' in each folder. Both of those are minor errors, though. If I had to guess, I would say the segfault is happening because of either a corrupted file that it's attempting to copy or because it's missing a file that it's expecting. Then again, that one is just a guess. Did you follow all the steps in the FAQ, verbatim? You should probably check
this thread to make sure you have all the required files (you should if you used the Assistant, but just to be sure).
Anyways, where do you want me to send the source code? If you manage to make any headway, please share so we can all benefit.
EDIT:
It occurs to me that you might have gotten one of my ill-conceived compiled versions of Tutu hackery. I don't think I ever uploaded it to the Mac Tutu page, but I did send it to a couple of beta testers. Could you verify the size of BGTutu (in bytes)? It's in the folder that looks like this:
bg1tutu/
bg1tutu/
BGTutu
BGBack
readme.txt