I have just found the same problem.
The log is as like:
413 [Thu Sep 26 13:47:55 2013] [error] Warning: Could not import Horizon
dependencies. This is normal during installation.
414 [Thu Sep 26 13:47:55 2013] [error] [client 192.168.1.228] mod_wsgi
(pid=11717): Exception occurred processing
I have just found the same problem.
The log is as like:
413 [Thu Sep 26 13:47:55 2013] [error] Warning: Could not import Horizon
dependencies. This is normal during installation.
414 [Thu Sep 26 13:47:55 2013] [error] [client 192.168.1.228] mod_wsgi
(pid=11717): Exception occurred processing