I have the plug-in. Everything appears to be working as far as VB is concerned except for one thing. When I log into Amember, it does not properly show me as logged in with vBulletin. But, the forum is on a sub-domain. Most people access the forum at http://forum.pcmech.com. However, it can also be accessed at http://www.pcmech.com/forum/. When I load up the forum the second way, it works. Using the sub-domain, it doesn't. This is most likely a simple cookie domain issue. VB is set to set the cookie properly, but I have no idea how Amember does it. Amember seems to assume the forum is on the same cookie path as Amember itself. Any input on a quick code hack for this? I will also submit this as a support ticket.
Check session cookie settings in your vBulletin installation: Set Cookie path to "/" Cookie domain to ".YOURDOMAINNAME.com" if vBulletin set cookie for subdomain, aMember will be unable to access that cookie so it should be set for .YOURDOMAINNAME.com (note point before domain name) then it will be available from all subdomains.