Hey -
I am still having trouble reproducing this problem myself. I created a project in 4.4.3 and created a copy in 4.5. I then created two blueprints (custom1 and custom2). Inside custom2 I added a function and connected a PrintString node.
In custom1 I set a key press event to “Get All Actors of Class” followed by a For Each Loop node. From the For Each Loop I was able to cast to custom2 and then print the string. Here is an image of how the custom1 is set up. Let me know if there is something different that you are doing to set up your cast nodes.
