ok, so it’s not a bug, I found mistake:
blueprint I’m working on has “replicated” set to true. This is not necessarily correct way to do it at moment (4.7.2).
blueprint is parent of other blueprints. Now when I set replicated to true in parent blueprint, child blueprints get replicated set to false as soon as I restart editor. This is because of a bug.
Therefore, I needed to set parent blueprint to not replicate in order to be able to have child blueprints replicate.
fact that it changes replication when restarting edtior led to much confusion when I tried to debug issue. Especially since the editor crashes often when testing multiplayer stuff.