Late reply, but I'll chime in, too. Friday was also our day for making FP+ selection. So, like the Disney nut I am, I was up at midnight logged in trying to capture FP+'s to fit our plan. In the past, this has been a 15 minute event. It took us well over an hour this time, though, due to server problems.
We kept getting consistent HTTP 500 errors and getting logged out. We kept trying, though. Persistence/stubbornness paid off and eventually we got everything we wanted. But it wasn't easy...we worked for it.
These things happen, but it's frustrating when it's your turn to select FP+.