Everything is shown in the video.
Everytime i change BP_Block blueprint i need to recompile blueprints which have BP_Block added in Construction Script with AddChildActorComponent node.
After i recompile related blueprints, there is also error in HUD blueprint which uses function(not related to anything) from Blueprint Function Library.
There is also a bug with blueprints save order, when i recompile(as seen in the video) and don’t press save, there is a crash which says “Renaming Object failed”
Engine version is 4.5.0
https://www.youtube.com/watch?v=db9smznl2JY
Hello ThePassenger,
Q: “Everytime i change BP_Block blueprint i need to recompile blueprints which have BP_Block added in Construction Script with AddChildActorComponent node.”
A: This is a known issue and has been reported to the development team.
Q: “There is also a bug with blueprints save order, when i recompile(as seen in the video) and don’t press save, there is a crash which says “Renaming Object failed””
A: This is a known issue and has been reported to the development team.
Q: After i recompile related blueprints, there is also error in HUD blueprint which uses function(not related to anything) from Blueprint Function Library.
A: You will need to delete (do not copy and paste) the “Get Trajectory point node” and reconnect it. This should solve the compile error. I took a screen shot of the video you gave me to show the node that I mean.
I hope that this helps
Make it a great day
Thanks for the answers. Have a good day 
Deleting and reconnecting GetTrajectoryPoint node didn’t work.
Hello ThePassenger,
After taking a closer look at your project. It seems that you need to compile the custom function “ProjectileMathFunctions”. This is what is causing the error. This will need to be done whenever the editor is opened. I believe the issue is caused because the values for this function need to be initialized. I hope this helps.
Make it a great day.