When I updated our system to 200301 from 200221 the Login Pro widget disappeared from the widget list and of course from the website homepage. I rolled back to the previous version and things are fine. Is this a known bug and when can I update?
200301 Update Problem
Hi Rich.
What most likely happened, is that you didn’t udpate the Pro add-on too. For Pro to activate, its version has to match the Framework’s. So if you updated the Framework but not Pro, the pro features become inactive.
Does that help? 
Yes, that was the problem. No update showed for the S2Member Pro addon, so I had to download it from the S2Member website. The two-file update process is certainly clunky!