Yup, the problem accessing AP's that have Welcome (Login) screens is due to my having the SGP5 set to a Static IP. After spending a half hour on the phone with the tech department at the UofM and another half hour with Samsung Support it looked like there was a problem with my SGP5 as neither have ever heard of someone with the problem I had. So I returned my player and got another one. One the way home I stopped by the local county library and sure enough it connected and brought up their login screen fine. I went home and again I had to set the SGP5 to Static IP to get it to stay connected to my Belkin N300 for more than the repeating 65 seconds (my DLink-524 does the same). I then went back to the library and this time it responded just like my previous player (no login screen). I when into the WiFi Settings and turned off the Static IP, reconnected to the library's AP and the Login came up when I started the browser. Problem Solved!!
So just thought I'd post my findings in case someone else has this same issue.