Can't configure the rewrite log
Which version of Apache?
In 2.4, RewriteLog* directives don't exist anymore as logging has been rewritten. In this case, you should append mod_rewrite.c:trace3 to your LogLevel line where traceX is the level of verbosity (8 >= X >= 1). The output will be written to Apache standard error log (ErrorLog).
Could you also run these commands:httpd -t (syntax checking) then httpd -w (run Apache but hold open the console, used as stderr)