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FPSCaracther blueprint always empty after closing it

Hi

I’m following the FPS C++ (https://wiki.unrealengine.com/First_Person_Shooter_C%2B%2B_Tutorial#Making_a_Character) tutorial from the wiki and each time I close the BP_FPSCharacter which is a FPSCaracter blueprint
it cannot be opened again, well it can but it would be empty.

Here i create a new FPSCarachter blueprint, double clic on it

https://dl.dropboxusercontent.com/u/91396766/ue4/emptyBP/n3-1.jpg

I do my stuff, compile, save, then hit the cross on the tab to close it

https://dl.dropboxusercontent.com/u/91396766/ue4/emptyBP/n3-2.jpg

Then if I want to re-open it again to change something all I get is this empty window
9746624ca994f4e3608eda424b009cb53adb9bcd.jpeg

What am I missing?

Note that my projectile blueprint which was created/modifier/closed the same way can be opened/closed as much as I want

Thanks