500 when trying to save settings

[choccyness]

Did you have any plugins or anything changed from default install?

Was it the login that 500 or the settings only?

No plugins. As myreply to Bigin just above this one, both were straight up extracts of the zips.

Broken (release) version the following URL's broke (but both work fine for the git version):

example.com/admin/ - for the fresh install this should give the install config page, but it gives a 500.

example.com/admin/settings - having "migrated" my site up, when I tried to save this page it resulted in a 500.

Conclusion to me is that there's something about the admin page that simply doesn't work for me in the official relase.