I installed the latest update to memberpress (3.1.51) and it broke my site. Content templates was not rendered, and I got an error message saying that the view was going into an infinite loop and was cancelled.
I restored a backup of the site, and as a test the only thing I did after the restore, was to perform the memberpress update, and the site broke.
I think its a database issue, that breaks the relations in the database, because images are not shown on post / pages, and related custom types are not found by Views, and the content templates are not rendered.
I have not yet contacted memberpress support, but I will.
I have restored a backup once more, so the site is fine by now.
But I am seriously considering moving away from memberpress, and back to a custom membership solution, build with toolset, so I am waiting on an update of the announcement made by toolset, in august 2018.
I'm afraid there isn't any progress to report. Subsequent to that blog post it was decided that there were other more important priorities for development, and the features described in that post are not currently timetabled for development.
They may be at some point in the future, or we may work on an alternative for an improved solution for membership sites, but at the moment it is not "on the table".
I'm sorry that I don't have better news for you.
If you have established that the latest Memberpress update has broken your site I suggest you start by speaking to their support about it (they will know what has changed in this version), and if you need to come back here with whatever details you can.