ergophobe - 4:52 pm on Mar 29, 2013 (gmt 0)
Currently after clearing the cache I can't get it to fail. I"m logged into a gmail account and have activated about 10 extensions that I normally don't even use.
I think it someone has something to do with being logged into a Google service because even with no extensions it generally reasserts itself.
It pretty much always works in incognito, so I assume this is related to an extension, a cookie or the very fact of being logged into some Google service.
When it fails, the Network tabs shows nothing or a single .png (I think it's something like "success.png" but I could be wrong about that.
Every time I turn off an extension and think I have it figured, it twinks out again. If I clear the cache, it tends to behave normally for a while.