Good morning, Alex!
You are correct. When I try to open JFBConnect from the Components menu, I get the Error 500 and a blank, white screen. I'm also noticing other menu options are gone as well.
www.akeebabackup.com/home/news/55-genera...512-312-updates.html
I use Akeeba Backup and Admin Tools, and when I get the email notices about upgrading the system, I take care of that upgrade almost immediately. (bleeding edge)
Found the link above this morning and noticed that this particular upgrade is NOT ready for prime time, so I'm just going to restore from backup and then try to upgrade SCLogin again. Feels like a Monday. Oh wait, it IS Monday!