Issue with 11n operation in AP mode

[cowherdboy]

I used the hostapd in kernel-version to create 11g AP mode with the rtl8192du. I was able to connect to the AP and ping it. Throughput was about 23 Mbps. However, when 11n was enabled I was only able to associate with the AP but unable to ping it. The following configuration parameters were used:

interface=wlan0 ssid=rtwap driver=rtl871xdrv channel=6 hw_mode=g ieee80211n=1 ht_capab=[HT20][SHORT-GI-20] wme_enabled=1

The station also disconnected and connected to the AP frequently. Any idea why this could be happening? Shall send the hostapd -ddd logs separately.