I'm using 2016071802.
But there is no point in switching, since the problem is hiawtha binary:
[root@mail ~]# hiawatha -c /etc/hiawatha/
Segmentation fault
[root@mail ~]# dmesg | grep hiawatha
hiawatha[2470]: segfault at 0 ip 00007fdf5a0b38ca sp 00007ffebc54f3b8 error 4 in libc-2.12.so[7fdf5a034000+18a000]
hiawatha[2603]: segfault at 0 ip 00007f9e541198ca sp 00007ffe5688def8 error 4 in libc-2.12.so[7f9e5409a000+18a000]
[root@mail ~]#
Did a 'yum downgrade hiawatha -y', same issue.
Use latest upload (2016071802) and then run 'sh /script/cleanup'.
In your issue, go 'switch program' and try select lighttpd and change back to original.