This issue sounds related to UE-27652, which was an issue with editing struct variables disconnecting pins in blueprints. This issue is reported as fixed in 4.12, so open up a copy of your project there and try it out.
Let me know if that fix works for you, and if not, please recreate the issue in a clean project and provide the repro steps that you used so we can see it on our end.
Struct links still break for me and I’m on 4.12.5. Same bug as it’s always been, except now my project is much bigger and converted over from several different versions of unreal (4.10, 4.11).
Anytime I create a new variable in any struct, about 30% of the structs around my project break. I’ve noticed that the ones breaking constantly are from several widgets I’m using as menus and UI interfaces.
Quick bug fix to change name, fix redirectors, sometimes doesn’t work.