500 on all pages except home page on fresh install

[Tue Nov 27 17:42:40 2012] [error] [client 127.0.0.1] Request exceeded the limit of 10 internal redirects due to probable configuration error. Use 'LimitInternalRecursion' to increase the limit if necessary. Use 'LogLevel debug' to get a backtrace., referer: http://spark.dev/

Getting this on a fresh install of latest alpha - latest version of MAMP with PHP 5.4.4 / otherwise known good setup for D6 & D7 sites.