If you recently updated, hostapd-1.1-armv6h.pkg might still be in '/var/cache/pacman/pkg'.
I am trying to get my Pi to create a wifi network that I can join from both my computer (windows) and my iPhone. It was working with hostapd 1.1, but I updated to 2.0 and only made a backup of the conf file. Here is the hostapd.conf file that WORKED for 1.1(with all the commented lines removed):
http://pastebin.com/Ucnx0neS
But after the update, only my computer could connect, and my phone would go into a connecting loop. It will ask me for the password (and tell me if its wrong if I enter an incorrect password), and then the loading spinner will appear a couple of times next to the wifi name. According to hostapd output, it connects for a very short time, then disconnects. I can post both hostapd output (-d or -dd) and iphone syslog output if anyone is interested.
I would also be interested in a hostapd.conf file that has allowed apple devices to join. Thanks.