I've done it more times over the last 4 or so days then any 1 man should and I just tried it again and it's still working. You can't use the same period placement twice which is maybe your problem? Another gmail trick is to add a + with some numbers. Like this...
Goodbyemonies@gmail.com < actual address
Goodbyemonies+666@gmail.com << Money pit trick
You can add any numbers you want after +
I will say like Mr. gregathon mentioned, going into incognito isn't a bad idea as that's what I do to avoid having to logout of my main account.