I'm starting to wonder if there's something up with the way vB3 handles cookies... I tried a bunch of different combinations to get my test board and my live board to work, and finally ended up completely locking myself out of my test board. Then I ran a script that changed the options so I could get back in, and it's worked perfectly ever since (go figure). The only difference from my original settings is the cookie domain was blank. On my live board, I have my cookie domain set to ".plurplanet.com" and cookie path set to "/". Then on my test forum I have the cookie domain blank, and the path set to "/". That seems to work perfectly for me, so maybe that will work for you? If not let me know and I'll try to think of something else that will work.