Glad I could help. I found it one way, Mick found it a much simpler way. All we need now is for DAZ 3D to work out how to get this login screen back so it associates with the forum login, instead of having to fumble around finding it. The convo I linked to has been flagged up.
Well ... it’s probably worth pointing out that the particular login screen in question is NOT secure. Because it’s bouncing you from a forum post, rather than the actual logon prompt, it’s an http:// rather than an https:// page. (The forum itself is not secure, only the logon is.) Since the same login is used for both the forum and the store, using that screen at all may not be a great idea.
For what it’s worth, on my other computer, I use Chrome rather than Opera or Firefox to access the site, and it never EVER logs me out of the forum on that workstation. The store, yes; for some reason, Chrome can and does treat the store and forum differently.
Just for the hell of it, I looked at the cookies inside the browser I use at home (Opera). As far as I can tell, the store cookie seems to be set to last about an hour (I think). Interestingly enough, there actually are separate cookies set for the forum. And they’re kind of a mess. There are a few different ones, and I’m not entirely sure what I’m looking at. One appears to be set to expire on Christmas Day, 2013. Another one was set to expire five minutes before I actually logged in. They’re just ... odd.