My ~amd64 machine updated yesterday to NM-1.0.0 and this morning I noticed the bad behavior described here:
https://bbs.archlinux.org/viewtopic.php?id=193660 The fix described by erno worked for me, but it took me a while to figure out how to implement it. The easy way is to right-click on the NetworkManager panel applet and choose the Edit Connections item to edit your wireless connection. In the editor window click on 'IPv6 Settings'. There is a drop-down menu labeled 'Method'. Click on 'Link- Local Only' and then Save. I'd never have figured this out on my own, so the Arch nerds bailed me out once again :)
