Are you able to provide your project? Probably not, that’s understandable.
But it could be very difficult to find a repro, fix issue and test it without “real” project. It’s just one of those cases where everything works for 99.999% of users and nobody knows what is the root of problem. Impossible to guess.
Maybe you could create copy of project, remove most of it, just leave a few scripts causing a problem. Pack all of it, with your Saved folder, let people download it.
It depends on which part of engine we’re talking about 
For instance there’s no new fancy features in blueprints. This release is all about stabilization and little improvement in quality of life.
There’s refactored compilation, so-called Compilation Manager. I’m not sure about details here, but it supposed to make compilation faster, probably fixing some issues too?
New feature of Orphan pins is meant to prevent “mysterious” bugs, improve process of refactoring your blueprints.
Hopefully lot of issues with resetting values (affecting some of the users) have been resolved. If not, editor prints more warning and errors.
Many annoying issues finally fixed.
Of course blueprints still needs lot of love, making it less cumbersome, more intuitive for people used to the “text programming”.