When I try to assign an actor on a editable variable using “pick actor” it doesn’t work.
The variable type is the same of the object. The icon “pick actor” appears but if I click the variable remains empty.
If I restart the editor all works fine.
Make sure you Compile / Save after having created such a variable, so all the proper references are created. If it still doesn’t work, it’s potentially a bug in your version of UE4. You may want to move to 4.18.