No, I hadn’t tried 4.5 yet, project was created completely in 4.4.3.
But I just installed 4.5 and hell yes, I can open game and broken BP again 
I will try to work with it (I’m still a litte uneasy abouth this because this error made me tear my hair out for past few weeks) and report back if issue returns!
In case it doesn’t: Thanks a lot for fixing this bug!