Re: Nexus 5 wifi authentication problem
Try clearing your system cache. Go to Settings, General, Storage, Cached data. Click OK to clear the cached data. Then turn WiFi on your phone off, then back on.
I seemed to encounter the same problem after I switched from a Note 2 to my new Note 3. I narrowed the problem down to Rogers 1 Contacts. After disabling 1 Contacts, everything seemed to go back to normal. Hope this helps someone else.
Not sure if it's device dependent, but I get automatic resize options in the native email app on my Samsung Skyrocket, but not when I use the gmail app.