I have downloaded FireFox and the system seems happier.
I have tried 4 wlan cards:
The system came with the Intel which I know doesn't work.
So I tried:
Broadcom BCM4311KFBG
Broadcom BCM4321KFGB
and
Airport Card for Mac Mini Intel, Mac Book # 661-3890
Replacement Part for Mac Mini Intel, Mac Book, Mac Book Pro, Mac Book Pro 17"
http://www.mac-pro.com/Airport-Card-for-Mac-Mini-Intel-Mac-Book-661-3890
I'm stumped.